Postecoglou laughed when asked if he would see what his players are really made of in their first test of the season.
"The first test? Losing the greatest ever player in this competition the day before the start of the season? Nah piece of cake. We lost players to almost season-ending injuries. Nah don’t worry about it," he joked.
"Mate there are tests all the time in my whole career, I figured out there are only two states of being as a manager - under siege, or it’s coming. I’m well aware that every day nothing runs smooth. There’s always challenges out there.
"I just try to make sure I don’t change my state of being. It is what it is. I try and focus on what’s important - we’re still building a team and an environment where people want to win. It’s not going to change from week to week.
"It’s fairly extreme even for a person of my experience to lose five players in one game, but that doesn't mean it's any worse than anything we faced so far, and it's being a bit disrespectful to this group of players to say that everything has gone their way, because it hasn't.
"From day one there’s been a real resilience and character in the group and they’re going to have to show it again. It’s already there."
So is the siege coming?
"No I reckon I'm there now," said Postecoglou. "Although I did win manager of the month so they should give me five minutes of grace