Australia landed in Russian Federation on Sunday six days ahead of their opening game at the 2018 World Cup against France.
This year's tournament will take place between June 14 and July 15 at 12 stadiums across 11 cities in Russian Federation.
However, Australia defender Trent Sainsbury headed into his own net after a misunderstanding with substitute goalie Brad Jones with two minutes remaining.
But it was far from a vintage display.
"Bad", he said. "Especially in the first half".
"I need them [his coaches] because they know how I work, they know how I want to work, they know how I want to play".
"When you want to have a chance in the World Cup, those things must be very, very professional and I think that's the case now".
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But after thrashing Czech Republic 4-0 a week ago, Australia laboured to a 2-1 win against Hungary in Budapest.
The Socceroos were low-intensity, unable to penetrate or get creative force Tom Rogic on the ball.
Their most spectacular effort, a first-time volley from Laszlo Kleinheisler, would have contended for goal of the year but dipped onto the crossbar before bouncing out.
Mat Ryan was on hand to make a one-on-one save from Adam Szalai to preserve a deadlock into the break.
Mile Jedinak and Tomi Juric came on at half-time, with Juric hauled off on 80 minutes for Tim Cahill.
Jackson Irvine's determination ensured the Socceroos would come out on top.
Van Marwijk was appointed on a short-term basis in January following the resignation of Ange Postecoglou, who guided the Socceroos to the World Cup via the inter-confederation play-offs. "That is positive. Morally it was good, we won, but I already told my players, I wasn't satisfied".