Perth Glory and the FFA are heading back to court as the club fights its salary cap penalty.

Perth Glory and FFA are scheduled to lock horns in court on Monday as the salary cap drama takes a bitter turn.

Glory were kicked out of the finals and fined $269,000 after being found guilty of exceeding the salary cap by around $400,000 this season.

Perth are determined to fight for their innocence, with the club filing an injunction with the Supreme Court of Western Australia in a bid to buy more time.

The club will argue FFA's board didn't have the right to impose penalties without first affording Perth a fair hearing under the league's statutes.

If the injunction is approved and it buys Glory enough time to play in the finals, it would be a nightmare scenario for FFA.

Should the injunction be dismissed, Glory are expected to launch an appeal through the usual FFA avenues.

FFA is staunchly standing by its decision to expel Glory from the finals, but the club won't go down without a fight.

Although the majority of Perth's squad is contracted for next season, the salary cap drama could give players the right to walk out on the club.

Some Glory fans have already demanded a refund of membership fees over the salary cap fiasco.

A section of the crowd expressed their anger towards owner Tony Sage and chief executive Jason Brewer during Friday night's 3-0 loss to Sydney.

In chaotic scenes, a 13-year-old boy was taken to hospital after being struck on the leg by a flare let off by the crowd.

A 16-year-old boy and a 15-year-old boy have been charged over the incident.

Glory coach Kenny Lowe is urging his players to stay strong in the wake of the salary cap punishment.

Perth will be back in action on Sunday when they host Melbourne City at nib Stadium.