Towards the end of his Socceroos tenure, Postecoglou adopted a formation that featured three defenders at the back with a packed midfield whose aim was to play aggressive attack-minded football.

But with his departure the risk based approach seems to have been replaced by Van Marwijk's more pragmatic back four that focuses more on defence and playing on the counter.

While the tactics will be key in Russia, former Socceroo Mark Schwarzer, believes the Dutchman’s man management skills and previous World Cup experience will be just as vital.

“It’s more about getting an understanding about the personnel, and the characters he believes can deliver on and off the pitch in a pressurised situation," he told FourFourTwo.

“We shouldn’t read into any of the friendly games at all.

“The manager is experienced enough to know what the players can do and can’t do and what they will be able to take on board.

“It is tough when you do make a change in management, particularly a team like the Socceroos who over the last four years have been drilled every time to play a certain way.

“But like I said with the amount of experience that Van Marwijk has the guy will have them playing the way he wants them to play and they will follow the system he wants them to play.

“What that will be only time will tell.”

Former Socceroo Robbie Slater echoes Schwarzer in that the only true indication of Van Marwijk tactics will be when Australia play that first group game against France.

“You saw the players behind Ange when Ange was coach and you see them the same with Bert, they are all behind Bert that’s what players do,” he said.

“But you’ve got a coach now who is the complete opposite to before in respect to philosophy and the way he wants to play the game

“It’s a complete different message in a lot of respects so it’s really a wait and see.”

While the tactics may be uncertain who Bert van Marwijk picks as his first 11 is also a major quandry.

With Socceroos skipper Mile Jedinak showing improved form and fitness in the friendly against  Hungary and wonderkid Daniel Arzani scoring his debut goal, Australia has greater options for the starting line-up.

Questions also surround the Socceroos defensive line and former Socceroo Tony Popovic believes Van Marwijck has some tough decisions to make ahead of Saturday night’s opening group fixture against France.

“In the last two games we’ve seen a lot more progress,” he said speaking to FourFourTwo.

“He got a chance to try a few different players and he’d have more of a headache than anticipated when he first took the job in terms of the options he has off the bench and the options he has to start.

“The results have been encouraging, albeit we looked a bit fatigued and tired in the second match against Hungary but we still found a way to get a result.

“Obviously, it’s  been a very short period of time  but they’ve been working extremely hard, as he wants them fit and fighting and understanding their roles.”