The Roar held on for all three points in an enthralling finish to go 11 clear of the Reds at the top of the table and it was the manner in which the win was achieved, without some top-line players, that thrilled Postecoglou the most.
"I'm really proud, it was a massive effort by the boys," the Roar boss said.
"It was a pretty young team out there, we lost some quality players during the week but also some experience.
"The boys worked really hard, it was a nail-biter in the end, but I am super proud of the effort."
But Postecoglou said that taking out the minor Premiership was not an overriding goal, rather a reward if they manage to keep up their good form.
"We've tried to focus on just playing well every week and not worry too much about the results," he added.
"It seems to be working with this group of players.
"There's no pressure on them, the last thing I say to them before they go out every week is to just play well and not worry about the result."