AC Milan midfielder Kevin-Prince Boateng says he'd walk off the pitch again if he came under racist abuse.
Boateng led his teammates off the field in a friendly match on Thursday against Pro Patria after he was jeered by a section of the home support.
"I don't care what game it is," he told CNN. "A friendly, Serie A or Champions League match, I would walk off again.
"I'm sad and angry that I'm the one that has to take action. All the people who support me would support me in a big game.
"Players like Rio Ferdinand and Patrick Vieira have supported me and I just want to say thank you.
"If it happens again, I'm not going to play anymore," he added. "The referee said to me 'don't worry' but I said I do worry.
"I was angry and I was sad. There were so many negative emotions that came up with me.
"I am surprised we're still hearing these things in 2013. It's not the first time in my life that I've heard these things, but I'm 25 now and I've had enough of this."