It's supposed to be known as the "Beautiful Game" but the ugly face of racism returned to haunt European football once again Wednesday.

Manchester City's Yaya Toure, the Ivory Coast midfielder, was subjected to "monkey chants" during his side's 2-1 Champions League win against CSKA Moscow in Russia.

City is expected to make a formal complaint to UEFA, the game's European governing body, with Toure urging for action to be taken following his side's victory courtesy of two goals from Sergio Aguero.