AFL boss Gillon McLachlan says he will not tolerate the game "being used to vilify" sections of the community after an anti-Muslim banner was unfurled during Friday night's match between Richmond and Collingwood.
McLachlan said the league would work with police and the Melbourne Cricket Club to indentify those behind the sign, which said "Go Pies! Stop the mosques".
He said if those involved with the banner were club members they would be banned from attending games.
The banner, emblazoned with the crest of nationalist group the United Patriots Front, was displayed beneath one of the MCG scoreboards during the Magpies' one-point win.
The group later posted a video of the banner being unveiled on its Facebook page.
Victoria Police said it "will assess the circumstances and review all evidence to determine if an offence has been committed".