Towards the end of the summer transfer window, Barcelona and Atletico Madrid reached an agreement over the transfer of Antoine Griezmann with the player leaving the Camp Nou on a two-year loan deal.

Following that, Barcelona released a statement announcing the move and mentioned a mandatory purchase option for Atletico, but not much else.

Griezmann moves to Atletico on a two year loan deal, and at the end of that period the purchase option comes into force, for a fee of around 40 million euros. However, it is not 100 percent mandatory, as it depends on games played during that period of time.

As a result, it may be that after the two year loan is over, Atletico Madrid don't need to buy Griezmann as he hasn't fulfilled the required number of games played.

Another clue in the agreement between the clubs also states that Atletico can buy the player at any time during the loan period. The transfer fee for such a purchase is already set out in the contract, but is unknown at this moment.

With all these clauses built into the loan deal, one thing is obvious... Griezmann will not be returning to the Camp Nou. The spirit of the agreement makes it clear that Atletico Madrid will retain his services over the next two years and beyond.

On the same evening, Barcelona obtained the services of Luuk de Jong on loan from Sevilla. The Blaugrana have a purchase option on the Dutchman, but it's not mandatory. In addition, part of the player's wages will be paid by the Andalusian side.