Sheffield Wednesday manager Dave Jones said Leeds fans were "vile animals" after one of the club's supporters assaulted Wednesday goalkeeper Chris Kirkland during their derby match on Friday.
"You talk about racism in the game, what about the chanting (by Leeds fans)? It's a form of racism in itself," said Jones after the match at Hillsborough.
A hooligan who ran on to the pitch and assaulted a goalkeeper during a Championship football match has been identified by police.
South Yorkshire Police have vowed to work with Leeds United and Sheffield Wednesday to find the fan who assaulted goalkeeper Chris Kirkland.