Police say one man was struck in the face and multiple fans were ejected from the venue after a fight broke out between opposing fans.

Attendees were reportedly shouting "knock him out" as the altercation began, which was supposedly sparked due to Collingwood taunts regarding the Pies' Grand Final win over the Saints in 2010.

Former AFL player and pundit, Garry Lyon, said the altercation was unforgivable.

“That’s a fair dinkum punch on,” he told SEN Breakfast.

“That’s unforgivable. There are women involved, there are men involved. The AFL would be absolutely off their nut about that and rightfully so.

“If that was the soccer, we would be screaming from the top of the trees.”