Was that the moment for Arsenal?

It's another set-piece opportunity for Arsenal, and this time it;s Gabriel who rises highest.

He can't keep his header down though.

There is still time left for Arsenal to grab a late winner, or will it be Porto?

It will probably be neither.

I'm making more substitution posts than matchplay posts, that tells you everything.

it's another from Porto, Wendell is coming off. he has been struggling for a while and now can't go on any further.

Eustaquio is on in his place.

Evanislon's night is over, so no goal for him.

He struggled to make an impact on the game in all honesty and he has been replaced by Toni Martinez.

Francisco Conceicao, the manager's son, is also coming off. He showed some signs of brilliant skill and caused some problems to the Gunners.

Goncalo Borges is on in his place.

It's a change from Porto and it's Nico Gonzalez coming off.

I felt Gonzalez did well in the middle of the park tonight, but Ivan Jaime is coming on for him.

Less than 10 minutes to go now.

I must say, this has not been the most exhilarating game I've ever watched.

If Arsenal come out of this with a draw, they will be happy. You would back them substantially at the Emirates.

However, if they can nick a goal in the last 10 minutes, that would be huge.

That is a brilliant goal!

It's the last action he does in the game, but it's a big one from Victor Osimhen.

The Nigerian striker does well to hold off the defender in the box before he turns brilliantly and slides the ball past Marc Ter Stergen.

They may not have deserved it, but it's a huge goal for the side from Naples.

I think it may be my fault, I should not have posted about Barcelona wanting a second.

Sorry Barcelona fans!

Wow, this is some stat.

It makes you realise how much Barcelona have struggled in recent years within Europe.

Robert Lewandowski's goal is a huge one for them. They will want another one before the final whistle to feel a little more comfortable.

Are they sure they got the number right though, they look like they're wearing the same kit.

Be more creative Barcelona's design team!

It nearly worked.

Porto come close through Evanislon who gets on the end of a low cross before seeing his close-range shot deflected wide.

Nothing comes from the corner, but the home side are starting to ramp it up here.

I feel a goal may be coming, you know.

While we haven't seen a goal tonight, you wouldn't get it from the atmosphere.

The Porto fans have been with their side all night, urging them on, and their side is responding.

Can they suck the ball into the net?

There it is!

It was always going to be Robert Lewandowski, we know he has a knack for goals.

It's a typical finish from the Polish striker. He cuts inside onto his right foot just inside the area, and pulls his shot back inside the near post.

It's a brilliant finish and exactly what Barcelona deserve.

Now it's Jakub Kiwior in the book.

Following the Leandro Trossard chance, Porto come flying down the other end and Kiwior gives away a free-kick after Francisco Conceicao gives him the slip, resulting in a yellow card.

The resulting set-piece is wasted though - launched far and wide of everybody in the box.

It was like time stopped for a second.

Leandro Trossard is a free man at the back post from the corner, he hits the ball sweetly, but can't keep it down.

It wasn't an easy chance, but he should be getting it on target.

That goes down as a good chance for Arsenal.

The manager's son is now in the book.

It was a needless one, a pull of the shirt, but he was never going to get away with it.

That's one each in yellows now.

Much of the same so far in the second half.

Arsenal having all the ball, Porto defending well. The Gunners need to be wary of the counter-attack though, it looks on for the Portuguese outfit.

Will this match spark into life?

I feel it needs another moment of magic.

The ball is rolling again in Portugal and Italy.

Will we get some goals in the second half? I certainly hope we do, would be great.

Arsenal haven't had a shot on target yet, so if they are to score they will need to do that.

The Gunners may just want to keep a clean sheet though, there is still a second leg to come.

Selfishly though, it would be great for more attacking football!

While we are waiting for the second halves to restart, why not follow our Premier League live blog.

Luton took a first-half lead away at Liverpool and looked to have stunned the league leaders, but in their usual fashion, the Reds have turned it around in the second half.

It looks like a lively one there at Anfield.

Follow it here:

Rio Ferdinand reflecting on that first half on TNT Sports:

I can’t believe it hasn’t gone in the back of the net, the place went wild like it was a goal.

Arsenal have had control, but the only time they have got near the goal was from set-pieces.

I would give credit to Porto though.

The whistle blows in Naples.

Napoli are lucky to be going in level, they have really struggled in this one, but they will be thankful Barcelona have not been able to take their chances.

It should only be a matter of time until the Spanish side do. The warning signs are there for the Italian side.

Not been a night for goals so far, let's hope that changes in the second half.

There is no need for added time it seems.

That game to a long while to get going, but after Galeno somehow didn't find the back of the net in the 22nd minute, it came to life.

I still can't believe Galeno managed to miss, everybody thought he had found the back of the net - I mean everyone!

That could be a big moment in this tie, and Arsenal need to take advantage of it.

They have had some chances of their own, but none that were too threatening.

The Gunners will want to step it up in the second half.

Every time Arsenal have a corner, they look dangerous.

Once again, a red shirt gets on the end of it - Kai Havertz - but it goes wide again.

Another good chance for the Gunners.

It's another good chance for Porto, this time from Evanilson.

He gets in on the right-hand side and his shot is struck sweetly but it goes wide.

I'm hoping this half doesn't end, but it will. The game has finally got going!

Sami Mokbel, Chief Football Reporter, in Porto:

Will Porto live to regret Galeno’s missed chance?

Even the tannoy operator thought he’d scored, pressing play on the goal that greets Porto’s goals only to quickly realise his error.

The chances are in full flow now.

This time it's Porto on the attack, and Nico Gonzalez let's fly from just outside the area.

For a moment it looked like it could cause David Raya some problems, but it flies over the bar.

Another chance for Arsenal, this time from William Saliba.

Saliba gets his head on a Bukayo Saka corner from within the six-yard box, but it goes wide.

I think he could have done better there, that's a good chance.

Kai Havertz also looked like he was running onto it and could have been in a better position.

This game is hotting up.

Arsenal have had a shot, I repeat, Arsenal have had a shot.

As a colleague in the office has said, 'it's time to get the bubbly out'.

All jokes aside, Arsenal will be pleased with their response to that missed chance.

It was Leandro Trossard with the chance from quite far out, it was always going wide.

That passage of play showed how careful Arsenal need to be in this tie.

They had controlled play up until that chance, and then bang, they were inches away from being behind.

Maybe that will be a wake-up call for them?

To be fair, since the post was struck, Arsenal have regained control of this fixture, they just need to start testing Diogo Costa in goal.

How has he missed that...

I am absolutely lost for words, the Porto fans were celebrating, I was about to type goal, but no.

Galeno first hits the post with a wonderful volley, the ball then comes back to him and you think he was guaranteed to score, but he fires it wide.

I still can't believe that didn't go in. Well, we have now had the first chance at least, and it was a big one.

That is a huge let-off for Arsenal.

It took 15 minutes for Pepe to give away his first foul, that's quite a long time for him.

The 41-year-old wipes out Martin Odegaard but evades a booking, however, the resulting free-kick comes to nothing.

Still no shots in this one.

Meanwhile, things in Naples have been a little more lively than Porto.

Barcelona are looking sharp, and have just had a change through Lewandowski.

He was fed the ball at a tight angle and his shot hits the side netting, not a bad start from the away side.

This has been a bit of a slow burner so far.

Neither side have had a shot yet. Arsenal are having all the ball, but are struggling to find good space going forward.

They may need to take it up a gear - I hope they do for our sakes.

Lamine Yamal has made history tonight.

At age 16 years and 223 days he is the youngest player ever to appear in a Champions League knockout match.

He has started well so far for Barcelona, already causing Napoli problems. He had a shot fly just over the bar after only a couple of minutes.

The atmosphere is incredible inside the Estadio do Dragao.

It will take a lot to keep these fans quiet, but Arsenal are certainly going to try their best.

They have kept the ball well so far, but Porto look well set-up defensively.

They may need to be patient.

Early yellow card for Declan Rice.

It looked like a sliding tackle that would never end, a bit like that famous Sol Campbell one for England.

Galeno is the player he wiped out, and he doesn't look to be doing too well.

Both games are now underway.

What a night it is set to be, let's hope it lives up to expectations.

The atmosphere is bubbling in Porto, can Arsenal ruin the host's night?

Diego Armando Maradona Stadium is all set for another special night of Champions League football.

While we have our focus on Arsenal, this is also set to be a mouth-watering clash, no matter either side's form.

Last season you would not have wanted to miss this match-up, so let's hope they can refind there form.

I think Barcelona are in a slightly better place to do so.

Sami Mokbel, Chief Football Reporter, in Porto:

So it’s 14 years since Arsenal have played in the Champions League quarter final. Tonight they have a great opportunity of making it through to the last eight.

Barring a major upset they’ll defeat Porto over two legs - and then it’s anybody’s ball game. Porto’s best hope of progressing comes tonight.

The Emirates in a fortnight’s time will be a cauldron. Victory tonight gives the Portuguese a chance.

Mikel Arteta, speaking to TNT Sports about making no changes:

One is momentum, one is the players performances give me no reason to change anything.

The more they play the more they understand each other. We have to build on that.

Arsenal have been looking sharp in the warm-up.

They are certainly men on a mission, could they be in for another big win tonight?

When the Gunners are in full flow they are a joy to watch, one of the best in Europe.

How key will David Raya be tonight?

After taking the gloves over from Aaron Ramsdale, the Spanish keeper has certainly had his critics.

Mikel Arteta has stuck to his guns though, and Raya has certainly started to settle in.

If he can keep a clean sheet tonight, that will be huge.

Is Evanilson the man who could break Arsenal hearts tonight?

The 24-year-old striker has been on fire this campaign, netting 19 goals in 27 appearances, with four of those coming in the Champions League.

The Gunners will go a long way to keeping a clean sheet if they keep the Brazilian quiet. If they don't, they could be in trouble.

I imagine lots of teams have been keeping a keen eye on this man - Arsenal are in need of a striker...

This is a tough question to answer, and I want to hear your thoughts.

Arsenal are embroiled in an incredible three-pronged title race this season with Liverpool and Manchester City.

Sitting only two points off the top, they will push their rivals all the way until the end of the season.

However, they have never won a European Cup. The Gunners have been after good old 'big ears' for a long time, they are desperate for that trophy.

So, that being said, if the Champions League trophy is achievable, would they sacrifice the Premier League for it?

Isn't one better than zero...

I must admit, this Napoli team is a far cry from the one that won Serie A last season.

However, they still have Victor Osimhen, who is a very sought-after striker around Europe.

They still have plenty of fire power to cause Barcelona damage.

Lamine Yamal starts again!

There has been a lot of pressure on the 16-year-old wonderkid to produce for Barcelona this season, and they are counting on him again tonight.

They have made two changes from the team that beat Celta Vigo 2-1 at the weekend.

They will want another win here.

Arsenal are unchanged!

Mikel Arteta has seen no reason to change the side that destroyed Burnley 5-0 away from home on Saturday.

I completely understand why, the Gunners have been on fire, why change something when it's not broken?

A big night ahead for this team!

The Porto lineup is out!

The Dragons have only made one change from their 2-0 win at the weekend against Estrela de Amadora.

They are going very strong, Nico Gonzalez is a name that pops out to me, formally of Barcelona.

Can this team topple Arsenal?

This is not good viewing for Arsenal.

The Gunners have never secured victory against a Portuguese club in Portugal, only securing one draw.

One of their three losses on the road in Portugal came against tonight's opponents in 2010, a 2-1 loss.

It's not just away from home they struggle though, they have only recorded one victory in 10 games overall against Portuguese clubs - against Porto.

Records are there to be broken.

In Naples, there is a lot at stake tonight for two big clubs suffering dramatic downfalls.

After both winning their domestic leagues last season, both are now having disastrous campaigns.

Napoli currently sit ninth in the Serie A, while Barcelona are third in La Liga - eight points off the top.

This means tonight is huge. Napoli are managerless after sacking Walter Mazzari only yesterday, and Barcelona are set to be managerless at the end of the season after Xavi announced he is leaving.

Either way, it will still be a great game, I hope.

The Estadio do Dragao - such a beautiful ground.

This has been a stadium on my bucket list for a very long time, and a few thousand Arsenal fans will get the privilege of being in it later.

They will be wanting to see their side win there, what a perfect night that would be for the Gunners.

It won't be easy though, the atmosphere in there will be electric.

Prior to tonight, Mike Arteta had a few words to say about Arsenal's recent poor history in the competition.

Someone called Messi was an obstacle as well and Bayern Munich that we faced twice.

They (the players) know that we have not been in the competition, obviously some of them were here and they know the story.

They know that what happened in the past is irrelevant, it is the challenge and ambition that we have now to go through.

It’s great (we are here). We have earned the right to be here. It’s been seven years since we’ve been at the top table for these kind off matches and 14 years since we were able to go to the next stage.

Most of my memories of Arsenal in the Champions League consist of them getting knocked out in the round of 16.

They haven’t got through to the quarter-finals of the European Cup since the 2009-10 campaign, where they beat…. Porto.

Well, they are going to have to get past them once again if they are going to make it into the last eight for the first time in 14 years.

In 2010 they ended up coming up against Lionel Messi – we all know what happened – but they don’t have to worry about playing against him this season.

They will want to start this round off on the right foot!

It’s a big night for Arsenal, Gunners fans are you excited?

For the first time in seven years, Arsenal are playing in the last-16 of the Champions League as they are set to face Porto in Portugal.

The Gunners’ recent record in the Champions League knockout stages is not a good one, but this is Mikel Arteta’s Arsenal, and they are keen to succeed where others have failed.

While we will be bringing you all the updates from the North London side’s big game, it is not the only fixture on the horizon tonight.

Naples also plays host to Champions League knockout football tonight, as Napoli face off with Barcelona – the battle of the fallen giants.

Both sides have not had good seasons after triumphing to their domestic title’s last campaign. European football is now imperative for them both. To get the key updates from this one, Mail Sport is the place to be.

So, strap yourselves in, this is going to be one hell of a night. I can’t wait for it to get started!