Warsaw , Poland ( CNN ) -- European football 's governing body opened disciplinary proceedings Saturday against Croatia over what it said was racist behavior by its supporters during a Euro 2012 match against Italy . UEFA said it was acting over `` the setting-off and throwing of fireworks , and the improper conduct of supporters , '' including racist chants and the displaying of racist symbols . The UEFA Control and Disciplinary Body will deal with the case on Tuesday , it said . Croatia drew 1-1 in the match against Italy in Poznan on Thursday , with Mario Mandzukic scoring for the Croatians and Andrea Pirlo claiming a goal for Italy . UEFA president Michel Platini urged fans who are attending decisive matches on Saturday night to `` conduct themselves with dignity and respect . '' Russia plays Greece in Warsaw , while the Czech Republic plays Poland in Wroclaw . `` Of course , there is rivalry and passion , and all teams want to win -- but we must remember that the results on the pitch are what really matter , '' Platini said in a statement . `` EURO 2012 is a celebration of football and I invite the fans , the vast majority of whom have conducted themselves in an exemplary manner so far , to continue to do so for the remainder of the tournament . '' The issue of racism has threatened to mar the soccer tournament , which is being co-hosted by Poland and Ukraine . Members of the Dutch squad claimed to hear monkey noises during an open training session in Krakow , Poland , before the tournament started , though the Dutch FA opted not to lodge an official complaint with UEFA . In addition , family members of two black English players chose not to travel to the competition for fear of being subjected to racism . UEFA has already taken the step of writing a letter to the mayors of each host city asking for a zero-tolerance approach to racist abuse . UEFA 's disciplinary body has also been busy since the tournament started just over a week ago . Russia has already been fined and handed a suspended points deduction for improper conduct against the Czech Republic , while also still awaiting the verdict of a UEFA investigation into alleged racist chanting during the match . The German Football Federation was fined $ 12,500 after its fans threw paper onto the pitch during a meeting with Portugal , with the Iberian team also ordered to pay $ 6,250 for delaying the start of the second half . A Danish player , Nicklas Bendtner , may also face sanctions next week after lowering his shorts during a game Wednesday to reveal that he was wearing underwear displaying the name of an Irish bookmaker named Paddy Power . Under the laws of the games as outlined by FIFA , the global body which governs soccer , undershorts must be the same color as the shorts worn by the player . His shorts were red but the Paddy Power undershirts were green . CNN 's Claudia Dominguez and Tom McGowan contributed to this report .
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 .