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Manchester City's Yaya Toure says he was subjected to "monkey chants" during a European Champions League match against CSKA Moscow in 2013. Epsilon/Getty Images
AC Milan's Mario Balotelli reacts to racist abuse from the visiting Roma fans at the San Siro in May 2013. It was not the first time the Italian-born striker has been racially abused in Serie A. Balotelli has since moved clubs and now plays for Liverpool in the Premier League. Claudio Villa/Getty Images
Serie A side Lazio was punished four times during the 2012-13 season due to racist offenses by its fans in European matches. Gabriele Maltinti/Getty Images
"I don't care what game it is -- a friendly, Italian league or Champions League match -- I would walk off again," the Germany-born Kevin-Prince Boateng, who has represented Ghana, told CNN in an exclusive interview in January after he walked off in protest at racist abuse he was subjected to in a friendly match in January 2013. Dean Mouhtaropoulos/Getty Images/file
U.S. star Jozy Altidore was subjected to racial abuse during AZ Alkmaar's cup win at Den Bosch in the Netherlands, again in January 2013. The match was halted and the crowd were asked to stop the abusive chanting before the action resumed. Dean Mouhtaropoulos/Getty Images
