Yaya Toure has revealed he and other black players will boycott the 2018 World Cup if Russia does not tackle the problem of racist abuse by fans.
Toure was subjected to monkey chants during Manchester City's 2-1 victory over CSKA Moscow on Wednesday, and the club have already launched a formal complaint with Uefa.
And the Ivorian insists the country must take action to try and stamp out the abuse before the world's greatest players arrive in Moscow in 2018.
When asked whether Russia needed to step up their fight against racism, Toure replied: "Of course they do. It's very important. Otherwise if we are not confident coming to the World Cup in Russia, we don't come.
"It was a few times, when I went into the goal area. I tried to score a goal and missed it, but some fans reacted," the 30-year-old said.
"I know we have the fight against racism, but we are not kids and we have to stop it now. [Uefa] have to react. I want to stop this. It is always the same. I am unhappy because the reaction of the fans was unbelievable.
"We had some racism in Ukraine [where he played for Metalurh Donetsk earlier in his career] but maybe only one, two or three people, not in groups like that.
"If Uefa don't take action, it will continue. We always say there will be action or blah, blah, something like that, but we have do that. I don't know what else to say.
"A couple of months ago my friend [Kevin-Prince Boateng] plays with Milan and had the same problem. Now with me, it happens again. I hope they [Uefa] do something, ban the club or the stadium for two years."