Victoria’s Minister for Sport John Eren revealed the Socceroos' face-off with the World's No. 1 on Tuesday will draw approximately 50,000 - about half the number that watched Argentina defeat Brazil 1-0 at the same venue on Friday.

The last time the Socceroos had a commanding result was a 5-1 thumping over Jordan in Sydney early last year.

Australia are currently third in Group B in the final phase of World Cup Qualification, equal on 16 points with Saudi Arabia and Japan, the latter with a game in hand.

Postecoglou feels the coverage of the campaign has put a damper on crowd numbers, particularly after last week's minor scare in Adelaide, when the Socceroos escaped with a 3-2 win over Saudi Arabia.

“If you pick up a newspaper or listen to anyone we’re not travelling well at the moment, so they’re probably not getting too excited by coming to see us,” Postecoglou said.

“I guess from that perspective, people make their own minds up, they choose how to spend their money and whether they think a game is worth watching.

“From my perspective it’s about preparing the team and making sure the people who do come, get entertained, we put on a good performance and send them home happy. Hopefully they tell a few people and they come next time.”

A lot of empy seats expected on Tuesday

Postecoglou is looking to rotate is starting XI against Brazil in preparation for the 2017 Confederations Cup in Russia with Tim Cahill, who missed out on the Saudi clash, assured game time according to the boss.

He also said Mat Ryan could be making way for back-up goalkeepers Mitch Langerak and Danny Vukovic in the friendly against Brazil due to the importance of game-time with other players.

“No one feels like they’re guaranteed they’re going to start," he said.

"I think Maty has played the majority of the games in recent times, but a lot of that is because Mitch has been injured for a bit of it.

“We’ve had injuries to other goalkeepers, Feders (Adam Federici) and Eugene (Galekovic) before that.

“Maty had his own challenges but I think all three goalkeepers are going well, Danny at training has been outstanding, and I’d hate to think anyone thinks their spot is guaranteed. We want competition in every spot and certainly the goalkeeping, all three are in good nick and that’s really important.”

Cahill agreed that even as the golden boy of the Socceroos, he was grateful just to be in this current camp.

“My end goal was to be here today, my end goal is to get to Russia when 23 players are selected,” Cahill said.

“It starts from 20 to 60 players who’ve been part of this long campaign for two years with the boss and we’ve evolved, things are going really well but the main thing is never taking it for granted.

“When we leave this camp, you’re always knowing it could be your last ever camp regardless if you’re 21 or 37, there’s new faces but our job with Mile (Jedinak) and Millsy (Mark Milligan) is to make them as comfortable as possible and when it comes down to the football it’s the main element of what we get judged by so it’s great to be here.”