Victoria could change laws to stamp out flares at soccer matches to stop games being spoiled by the "silly actions" of a small number of supporters.

New controls on who can buy the marine safety devices could be introduced after almost 30 flares were set off during the A-League's Melbourne derby on Saturday.

Premier Daniel Andrews is open to changing the law, the opposition says it is damaging soccer's image, and Victoria Police worries a flare will hurt an innocent bystander.

"There's a big increase in the amount of flares being let off at these events, and they are an ugly blight and dangerous to people," Chief Commissioner Graham Ashton told 3AW radio on Wednesday.

Four flares were set off inside Etihad Stadium during the Melbourne Victory-Melbourne City game and another 25 set off outside.

Mr Andrews was at Saturday night's game with his children and said it was a "great game spoiled a little bit by the silly actions of a very small number of people".

He will take advice from Victoria Police and, if flare-related changes are required, he is prepared to do so.

Liberal leader Matthew Guy said flares were a throw-back to hooliganism the game had moved on from.

"The days of turning up chairs and throwing off flares I think should be days of the past," he said.