The head of the worldwide union for footballers has said that Euro 2012 players are at risk of racism in Poland and Ukraine.
The secretary-general of FIFPro, Theo van Seggelen, also fears that fans from visiting countries will receive a hard time from Polish and Ukrainian supporters away from stadiums.
Van Seggelen told BBC Sport: "Ukraine will be very difficult for fans.
"I think that this tournament will not be remembered for the atmosphere - that for me is 100% sure. Ukraine is not the ideal place to play this kind of event.
"We have to hope [the Eastern European fans responsible for racism and violence] are not the same people who are watching the games in Poland and Ukraine [at Euro 2012] because then we have a real problem.
FIFPro's research into racism, violence and match-fixing in Eastern Europe revealed that just over 10% of players questioned had been victims of violence, with over 50% of all those incidents blamed on supporters.