Didier Deschamps knows the quality of the 27-year-old and considers him to be "the leader of the French attack", but as such expects more from him.
The legend was banned for 15 months during his time at Napoli because of cocaine and was later banned from the 1994 World Cup after testing positive for ephedrine.
The 57-year-old, who managed his nation at the 2010 World Cup, has been a constant presence in Russian Federation this summer, with his freaky behaviour attracting plenty of attention - he even required medical attention after Argentina's thrilling win over Nigeria.
The best players at this World Cup - players like Luka Modric, Isco and Juan Quintero - fit into their teams and make them better.
He struck twice in an opening win over Tunisia before bagging a hat-trick in his next outing and is the key figure for a youthful England side.
This year, despite moments of brilliance, he didn't really get going and heads home having once again failed to score in a World Cup knockout game. They came closest with this squad in 2014, when they lost in the final of the last World Cup, and in the Copas America in 2015 and 2016.
After scoring the first in the 2-2 draw against Morocco, Isco will look to carry his form into the Last 16 match against Russian Federation.
After an opening round draw with Iceland where the Argentina attack was nearly completely stifled, they were comprehensively walloped by Luka Modric and Croatia.
Thanks to a poor showing in the Group Stage, Argentina came in second in Group D (with Croatia winning the group.) La Albiceleste opened up the World Cup by playing Iceland, a country with a population of 350,000, to a draw.
A brace from Edinson Cavani (in the 7th and 62nd minutes) secured Uruguay a place in the World Cup quarter. The Frenchman has been one of the players of the tournament so far, and this was arguably his best performance of the lot.
Aguero celebrates scoring a goal.