Postecoglou was tipped by many to struggle after making the move from Japanese football last summer on the back of a season that saw Celtic finish without a trophy, and 25 points behind champions Rangers in the league.
But the 56-year-old has confounded critics with his success this season earning his both the PFA and Scottish Football Writers' Association Manager of the Year awards.
"Part of it is that going into it there wassn't a great deal of expecatation in terms of success," he said.
"Whether that was because of me and my own background or the ground we needed to make up.
"Whether it was the PFA or the Writers [award], people just recognised the challenge we had and how we've embraced that challenge.
"I take great pride in it. I didn't get the one I was favourite for - sacked by Christmas - but I got everything else so it's okay."