NEW : Croatia president Tom McGowan urges fans to behave at decisive matches Tuesday . UEFA says there were racist chants from Croatian fans during a match against Croatia . The issue of racism threatens to mar a Euro 2012 soccer tournament . '' Platini said in a statement . A disciplinary panel will consider the cause against Croatia on Tuesday .
NEW : Croatia president Tom McGowan urges fans to behave at decisive matches Tuesday . UEFA says there were racist chants from Croatian fans during a match against Croatia . The issue of racism threatens to mar a Euro 2012 soccer tournament . A disciplinary panel will consider the cause against Croatia on Tuesday .