The perpetrator was sitting in the Victory supporters' bay when the flare was lit and was arrested after the club's fans pointed him out to officials.  

He is facing charges.

And while Gallop admitted the A-League was still working through a number of issues in relation to such behaviour, attitudes were changing.

"I think we definitely saw on Saturday night the reaction was 'identify the guy, get him out of the ground', the crowd booed, those are signs that we wouldn't have seen in the past," Gallop said on Monday.

It is not known if the incident will lead to sanctions from the A-League but Victory has been issued with a show-cause notice.

It follows an incident last year when Victory and Wanderers received suspended three-point penalties for similar activities.

Western Sydney Wanderers were hit with a show-cause notice after flares were lit in the Red and Black Bloc during their opening round clash with Sydney FC last weekend.

"Although there were incidents of flares, we saw wholesale booing, Melbourne Victory fans identified the perpetrator and I think those are positive signs," Gallop said.

"But we've got to stay serious about the fact we don't want to see flares in the game.

"We've got to stay vigilant but there's certainly some positive signs that the whole game is embracing the idea that we don't have flares inside our grounds."