The man in charge of the green and gold has one week to make his team more threatening after they drew a blank in their last run-out
Although Australia lost their final warm-up game before the World Cup, conceding a Nikica Jelavic goal in the second half of the friendly, there was plenty to like about their approach to a game against highly rated opponents.
Postecoglou singled out the work of his backline, well marshalled by the fit-again Matthew Spiranovic, as a significant improvement from the underwhelming 1-1 draw with South Africa last month.
"Overall it was ok," he told Fox Sports.
"I thought our general play was quite good, particularly in the first half. Defensively we looked strong which was pleasing. Bit of an unfortunate goal. We probably just lacked a cutting edge up front tonight.
"With better decisions we could have created some opportunities for ourselves. That's probably the one area we were a little bit disappointing.
"I thought Bresc helped that when he came on, he found little pockets and was causing some problems around the edge of the box," he added, referring to the second-half introduction of Mark Bresciano.
"Everyone got through it, it was a tough game in tough conditions against a quality opponent."
Postecoglou's attention now turns to Australia's first game of the World Cup against Jorge Sampaoli's Chile next Saturday morning (AEST).
"Every day is a challenge and we're looking forward to it," he said.
"The players have worked really hard, obviously now with that game out the way our next focus becomes the first game against Chile and it's going to be a fantastic test for us. One we're looking for to."