According to several sources, a heated incident occured after the City game.
Arteta, City's co-coach, is said to have been celebrating ignorantly, in the tunnel after the game around Leo Messi.
It is reported that Leo said: "Go and enjoy yourself in your dressing room. Do not do this here"
But it's also said that he was heard shouting: "Stupid, come here and show your face, don’t hide” outside City's dressing room.
Aguero has said he tried to calm Leo down. Manchester City have said Arteta did nothing to provoke Leo.