Fans of CSKA Moscow have crossed the line in the club's Champions League match against Manchester City with a number of racist chants.
Yaya Toure was particularly upset about what he heard during the match, according to both BBC Sport and Telegraph Sport:
#MCFC's Yaya Toure, when asked if he'd heard racist chanting: "I told the ref. I think it was unbelievable & very sad. We want to stop that"— BBC Sport (@BBCSport) October 23, 2013
Yaya Toure on racist abuse in Moscow: "I was quite disappointed. It was unbelievable and very sad on my part... Uefa have to do something."— Telegraph Sport (@TelegraphSport) October 23, 2013
They will be forced to play their next Champions League game with a section closed to the fans.