Western Sydney Wanderers executive chairman Lyall Gorman said football "thugs" will be banished from the A-League in response to ugly scenes at a Sydney FC trial game.
Gorman and Sydney FC CEO Tony Pignata were united in their condemnation of a small group who caused trouble at the pre-season game at Campbelltown Stadium between the Sky Blues and Macarthur Rams.
And they vowed to work with the NSW Police to identify the culprits and ban them from A-League matches.
"Sydney FC will not tolerate anyone who displays the type of anti-social behaviour we saw last night,” Pignata said.
"We will work with the police to identify those responsible and then work with the FFA to ensure they are banned from attending matches.
"These people are not football fans. They are not Sydney FC fans. They are not Western Sydney Wanderers fans. They will not be attending Sydney FC matches."
Gorman, the former Head of A-League, could not hide his fury at those responsible for the fight that injured two persons, including a six-year old boy. “These people are not football fans, they are not a part of either club and they are not welcome in our game," Gorman said.
"They are thugs who go into sporting arenas to cause trouble and they will be obliterated from our game.
"I don't care who they are, their anti-social behaviour cannot and will not be tolerated.
"Once the police identify who they are it is our responsibility to make sure they do not attend games and they do not take away from the family friendly atmosphere we have managed to create at A-League games over the years."
Pignata and Gorman said the clubs would work together and with organised fan groups to ensure a strong but friendly rivalry.
"Sydney FC and Western Sydney Wanderers will sit down with the respective fan groups, together, and ensure that the passionate rivalry we all hope the Sydney derby evokes remains friendly," Gorman said.
"Sydney FC fans are passionate football fans and they are just as upset as we and the Western Sydney Wanderers fans are by the actions of these people," Pignata said.
"We will work with them, and the Western Sydney Wanderers to ensure that behaviour such as this is removed from our game."
Goalkeeper Mat Ryan, defender Pedj Bojic and midfielder Oliver Bozanic look to have played their last games for Central Coast Mariners as the A-League champion faces a raft of departures.