Soccer fans have ripped flares during another A-League game as police revealed the Melbourne derby had been marred by violence.

A total of 20 fans were evicted from Saturday night's derby between Melbourne Victory and Melbourne City with nine flares set off - two during the game. The violence broke out before the game began.

Fans set off flares during A-League Melbourne derby. Credit:Getty Images

The stadium erupted into loud boos when the flares were lit as fans put their club at risk of a huge fine after the $50,000 fine handed to the Western Sydney Wanderers following similar fan misconduct.