Collingwood investigates alleged racist slurs aimed at Carlton star Chris Yarran Carlton star Chris Yarran in action on Sunday. AFL boss Andrew Demetriou has mooted league-imposed bans on fans found guilty of severe cases of racial abuse towards players. Demetriou said he supported Collingwood in its investigation following allegations two members abused Carlton player Chris Yarran during last Sunday's blockbuster at the MCG. "If there is anyone in the crowd that thinks it's OK in this day and age they will be dealt with if there was proof," Demetriou told 3AW this morning. If it was very severe then the AFL might take action... we might prevent someone from going to the football for some period of time. It is claimed that one of the men called Yarran a "petrol sniffer" and the other said he was a "black ----" after he scored a goal. Collingwood chief executive Gary Pert said last night the club had launched an investigation after receiving a formal complaint from a Magpie member that offensive language was used towards a Carlton player. "We have been advised of the seat numbers of the two club members who allegedly racially vilified the Carlton player," Pert said. The alleged slurs happened during Sunday's AFL match between Collingwood and Carlton. Photo: Getty Images Several members of the crowd have claimed the language was highly offensive and we are now making contact with other members who may have been within earshot. I would encourage anyone who was at the game and witness to the alleged behaviour to contact the club. Our position on vilification is absolute. If the allegations are proven, memberships of the offenders will be cancelled indefinitely. The Magpies have zero tolerance to racism and withdrew the membership of a 20-year-old who called Nigerian-born Gold Coast player Joel Wilkinson a "monkey" during a game at the MCG last July. Collingwood member Ray Stewart, with wife Jacqui, labelled the slurs "disgraceful." Picture: Jon Hargest Magpie Dale Thomas pledged his support to Wilkinson as they walked off the ground and then lodged an official complaint. Another Collingwood member, Ray Stewart, said yesterday he contacted the complaint line at the MCG on Sunday to report the racial abuse and, while MCC security staff and police spoke to a person, they did not ask him to leave the ground because it is understood they could not positively identify him. Mr Stewart, who was with a group of friends and family, said the offending person always sat in the same reserved seat in an area set aside for Collingwood members at home games. "I was disgusted that he wasn't escorted out," he said. The security and police never asked anyone their opinion. It's just so wrong. Mr Stewart said he was about three metres away from the man at the time. "People like this should not be allowed to go to another footy game . . . it was just so disgraceful," he said. Mr Stewart said the man, aged about 50, was wearing football shorts, a T-shirt and thongs.