The league leaders were tested both mentally and physically by a plucky Newcastle Jets outfit who made all the running but were very unlucky not to get more than the 1-1 draw.
But the Roar boss was happy his players were able to grind out a result as all champion teams do.
"It was a tough game obviously, but you've just got to love the boys' spirit," Postecoglou said.
"It was an easy one for us to maybe lay down a little bit, it was a pretty physical game and we've had a hard slog recently.
"You got to love their spirit, they never chucked it in and we got the point."
And for the second match in a row, Costa Rican striker Jean Carlos Solorzano came off the bench to score a late goal after his 88th minute winner against Melbourne Heart on Sunday.
"He gives us something different for sure," Postecoglou added.
"All his goals have been in the six yard box and he's been waiting to pounce on things.
"The goals have all been pretty vital, they've either gotten us a point or all three points."