At least six men involved in a violent brawl during the AFL season opener could still face charges, according to Victoria’s police chief.

A 19-year-old has already been fined for riotous behaviour following last Thursday’s post-match dust-up, after Richmond’s 33-point victory over Carlton.

“Initially there were fines, but looking at the footage, it’s serious enough to warrant an affray investigation,” Chief Commissioner Graham Ashton told SEN radio on Tuesday.