The former Celtic manager insists he's not a clown, and 'never will be'.
Postecoglou spoke to the media a short while ago to preview Spurs' Europa League final against Manchester United in Bilbao.
The all-England game will take place at the San Mames in the city on Wednesday night.
Postecoglou was answering a question from an Evening Standard reporter, Dan Hutchison, who wrote the article about his status 'teetering between hero and clown'.
Former striker says playing for Celtic was the 'biggest flex' of his career
Adam Idah eyes up his 'first treble', says winning trophies was why he came to Celtic
"That depends on your outlook, Dan," Postecoglou said in response to a question from the journalist. "But I'll tell you one thing, tomorrow, I'm not a clown, and I never will be, mate.
"You've really disappointed me that you've used such terminology about a person who, for 26 years, without any favours from anyone, has worked his way to a position where he's leading a club out in a final of a European major competition, for you to suggest that somehow, us not being successful means that I'm a clown, I'm not really sure how to answer that question."
It's been widely reported that Postecoglou could face the sack as Spurs boss after two years in charge should Ruben Amorim's side prevail as winners in Spain this midweek.