Squad numbers are often a contentious issue for football fans, so eyebrows may have been raised upon seeing what was on the back of Alisson's Brazil shirt on Saturday night. 

The Liverpool goalkeeper turned out for the South Americans in a warm-up friendly against Mexico, ahead of this summer's COPA America, but wasn't wearing the usual number on his jersey. 

Instead, Alisson took to the field wearing the goalkeepers shirt with the unusual number of 110 on the back. 

However, before shirt aficionados run to complain, there was a reason behind the shirt number and it won't be repeated. 

The number 110 shirt was worn by Alisson due to him be captain on the 100th anniversary of the Selecao.

Alisson wore the number 110 shirt for Brazil during Saturday's friendly win over Mexico 

Alisson led the team out for the friendly encounter, it what turned out to be a thrilling win for the Brazilians. 

Dorival Junior’s men went 2-0 up thanks to goals from Andreas Pereira and Gabriel Martinelli and look to be cruising to victory. 

But late in the second half Julian Quinones pulled one back before Guillermo Martinez Ayala made it 2-2 in stoppage time. 

Yet, the final twist was to come as teenage sensation Endrick headed in the winner for Brazil in the sixth minute of added time. 

The five-time World Cup winners have one more friendly against the USA on Thursday, before staying in the States for the COPA America.

It's the first time America has hosted the COPA American proper, and Brazil have been drawn in a group with Colombia, Paraguay and Costa Rica, who they begin the campaign against on June 24th. 

Defending champions Argentina, led by captain Lionel Messi, will kick off the tournament against Canada in Georgia.