Spurs face United in Bilbao on Wednesday with a chance to win their first trophy for 17 years, which would mean qualification for next season's Champions League.

Postecoglou, whose side are 17th in the Premier League -- a place below United -- has been under mounting pressure over recent months as results have nosedived.

Many observers believe the Spurs manager could be out of a job regardless of the result at the San Mames stadium in northern Spain against Ruben Amorim's fellow strugglers.

Postecoglou was asked at his pre-match press conference on Tuesday whether he was aware he was walking a fine line between infamy and history ahead of the match.

"That depends on your outlook but I'll tell you one thing -- irrespective of tomorrow, I'm not a clown, I never will be mate," he said, directly addressing a reporter who had used the word in an article.

"It's really disappointing that you use such terminology about a person who for 26 years, without any favours from anyone, who's worked his way to being in a position where he's leading out a club in a European major competition, for you to suggest that somehow us not being successful means that I'm a clown."

- Trophy drought -

The former Australia and Celtic boss said he had worked tirelessly to turn things around at Spurs, who have not won a trophy since 2008 and have not tasted European success since 1984.

"I've tried as hard as I can to stick to that process in getting the club to a position where they can challenge for trophies and at the same time, rejuvenate the squad and change the playing style," he said.

"It has been a fair assignment with plenty of challenges along the way.

"With such a big game tomorrow, there is an opportunity to fulfil at least the main task I was given which was to bring trophies to the club."

Postecoglou said he had not addressed his future with his players because it would not be "helpful".

"I've said to the lads from day one, nothing is guaranteed in life, nothing is guaranteed in sport. You've just got to try and make sure you take every opportunity before you and that's what I've done my whole career," he added.

"I've been in this position before, where the big game was the last game I managed. It's not unusual territory for me."

He said: "My future is assured. I wouldn't be the first person who changes jobs. We all change jobs. I'm sure you've had more than one job. My future is assured. I've got a beautiful family, I've got a great life.

"I'll keep on winning trophies until I finish, wherever that is. Don't worry about my future mate."

But the 59-year-old feels he still has a job to do at Spurs, who finished fifth in the Premier League in his first season in charge, in 2023/24.

"I really feel like we're building something and what a trophy does is hopefully accelerates that," he said.

"So I still think there's a lot of work to be done. That's quite obvious with the challenges we've had this year, but also there's been some growth that I'd like to see through."

Postecoglou confirmed that Lucas Bergvall would not be fit to face United. James Maddison and Dejan Kulusevski are also out.

But Pape Matar Sarr is available after he was taken off in the 2-0 defeat against Aston Villa on Friday.