Western Sydney Wanderers have announced a ban on their Red and Black Bloc followers after the controversial supporters group released flares and clashed with police during Sunday's derby.
A letter sent to members on Tuesday afternoon made it clear that the Active Support Area would be closed for the team's upcoming game against Perth Glory at home on Sunday March 4.
"The Western Sydney Wanderers maintains its position that it will not accept offensive behaviour being displayed at its matches and also will not accept the illegal use of incendiary devices," the email continued.
"The Western Sydney Wanderers maintain that the majority of those Members in the Active Area have been outstanding and supportive of the Club and the team.
"Unfortunately a small group have made this action unavoidable. Investigation into those directly responsible for the lighting of flares is continuing."
Western Sydney Wanderers explained that members who usually sit in the active area will be moved to alternative seats, and that the updated arrangements would be sent out later in the week.
They added: "The Active Area will be reopened for the following match against Wellington Phoenix on 10 March 2018, however should there be any further breaches of the terms of admission then the Club reserves the right to close down the Active Area for a further indefinite period."
The RBB came under fire over the weekend after flares were lit in the supporters' area during Sunday's match against Sydney FC at Allianz Stadium.
A number of fans were also snapped wearing t-shirts that said "F*ck FFA" and the A-League has threatened to penalise the Wanderers after reports of clashes between supporters and police at the Stadium.