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Police are reportedly investigating the Etihad Stadium brawl between Collingwood and St Kilda supporters on Saturday night.

The violent scuffle took place in the EJ Whitten Legends Bar, located within Etihad Stadium where a group of people were seen throwing punches and tossing glasses at one another.

The EJ Whitten Legends Bar that the fight took place is a standing room, open to the public with a clear view from behind the goals.

An AFL spokesperson has confirmed that the AFL is working in cooperation with police to investigate the matter.

"Stadium security staff were positioned in the area and the Victoria Police were called, responding immediately," the AFL spokesperson told afl.com.au.

"Police are now doing further investigations and this matter is under their jurisdiction."

"Patron safety is Etihad Stadium's number one priority, and the AFL and the Stadium do not condone any behaviour that threatens the safety of others.

A Victorian Police spokesperson revealed to afl.com.au that one patron was struck in the head during the incident.

"Police were called to reports of an altercation at a licenced premises inside a sporting venue in Melbourne about 9pm on Saturday," a Victoria Police spokesperson told afl.com.au.

"Parties were spoken to and some of the people involved were ejected from the venue."