A businessman arrested over a brawl after an AFL game has had assault and affray charges withdrawn but has been convicted of possessing cocaine.

Paul Finn, 46, was one of several men caught on camera and investigated by police over their involvement in a brawl at Marvel Stadium on May 25 last year after Collingwood beat the Western Bulldogs.

Paul Finn (on right), pictured with Kevin Sheedy and James Hird, was banned for life by the AFL from Marvel Stadium.

His lawyer told Melbourne Magistrates Court on Friday that Finn was present during the incident but not responsible for any violence.

"He broke up the altercation," defence counsel Anna Balmer said.