As Rudan prepares to explain to Football Australia why he shouldn't be sanctioned for provocative comments about the standard of refereeing in a 4-3 loss to Macarthur earlier this month, Wanderers owner Paul Lederer could also come under scrutiny.
Lederer was seen berating officials after Sunday's 3-3 draw with the Newcastle Jets - when Wanderers duo Jorrit Hendrix and Tate Russell - with FA confirming they would be reviewing the chairman's actions.
Billionaire owner Lederer was chair of the Australian Professional Leagues - the body which controls the A-Leagues - until late last year and remains a director.
But Rudan, who has until Wednesday to argue his case after being handed a show-cause notice, says he fears being pushed out of the game for daring to voice a concern over its direction.
Postecoglou walked away from the Socceroos job in 2017 because he was frustrated by the sport's inability to make progress, while Rudan's good friend Ante Milicic did similar in 2022.
The Wanderers fans voiced their support for their manager by unveiling a banner which read: "Rudan, leading by example, truth spoken" and Rudan said he appreciated the backing.
"It was nice to be appreciated for standing up for them," Rudan said.
"Having someone that can do that when they probably can't ... but at the same time I'm also standing up for the game.
"One of the best coaches that we've ever produced, who's now in the EPL, walked away from the game.
"He had his own reasons for it and they were pretty strong reasons, maybe that's what the system, the establishment does to you."
Rudan said he had no intention of bowing down to FA and said he intends to fight the show-cause notice every step of the way.
The Wanderers boss could be fined, reprimanded or suspended if FA determines that he has breached their code of conduct.
"My club is going to back me and fight it," Rudan said.
"You get put into a corner, you have got a decision to make, that's for everybody in life.
"You take the punches and you walk away feeling sorry for yourself or you stand up for yourself and you carry on and you move forward.
"That's called resilience. It's called character, but I'm never going to back down for this football club and the fans and my players and staff. Not a chance."
