Football Federation Australia on Monday threatened to sanction Melbourne Victory after fans lit flares, hurled bottles and assaulted journalists in the latest unruly A-League game.

The club was given until Wednesday to show why they should not face penalties for bringing the game into disrepute following Saturday's derby match against Melbourne City.

It is the second such scandal in recent weeks after the FFA gave Western Sydney Wanderers a suspended three-point penalty and a Aus$50,000 (US$36,000) fine after their fans let off a series of flares at a game.

The governing body said it had received reports from state police, stadium management and the FFA's security advisers about incidents that took place before and during Saturday's game.

A total of nine flares were lit before and during the game, while some spectators also hurled bottles at Melbourne City's Danish goalkeeper Thomas Sorensen.

Police said a television reporter and cameraman were assaulted on the way into the stadium and 20 people were evicted.

FFA chief executive David Gallop said he was stunned at the incidents, given that they happened at a time when A-League spectator misconduct has been in the spotlight.

"FFA has today issued Melbourne Victory with a show cause notice after receiving detailed information from Victoria police and others that identifies some Melbourne Victory supporters as taking part in actions that have cast a shadow on football," he said in a statement.

"The timing of these incidents has shocked many people given the acute focus on these issues.

"No one could have missed the fact that FFA, our clubs, players and coaches have been explicitly clear in our condemnation of actions over the last week around the ignition of flares.

"We must continue to hold the safety and enjoyment of true football fans at the heart of our decisions."

Victory chief executive Ian Robson said those involved were not fans of the club.

"They are not welcome and we do not want them involved. We will be reviewing all of the matters raised in the show cause notice, before we respond to FFA," Robson said.

"Further, we will also be reviewing all facets of our match day operations to heighten our vigilance in eradicating this behaviour."

FFA said it would work with police and stadium security to identify individuals and ensure they were subject to new procedures to ban troublemakers from grounds.

The new procedures would include an 'intention to ban' notice and provide an appeals process for people who receive bans.

Under the new rules, a total of 198 people currently banned across the A-League will be able to apply to have their case reviewed by a committee.

The new procedures follow a furore after a leading newspaper printed names and photographs of the 198, prompting fans to boycott A-League games in protest.