The former Celtic manager, who left Glasgow for North London nearly two years ago, secured Spurs' first trophy in 17 years when his side defeated Rubin Amorim's United side in Bilbao a couple of weeks ago.
However, after a dismal Premier League season domestically, the 59-year-old's job is under threat. According to ESPN, Postecoglou will learn his fate as Tottenham Hotspur's manager this week, with sources telling the publication that his position is 'under threat'.
Sources have also stated that new CEO Vinai Venkatesham, who was previously at Arsenal, will play a part in determining the former Yokohama F Marinos and Australia coach's suitability to take the club forward.
Though he delivered silverware, as well as a fifth-place finish domestically in his first campaign, last season's placing of 17th has disappointed those higher up, according to ESPN.
Former Celtic defender lands Scottish Premiership manager job
Former Kieran Tierney teammate spots major intent in Arsenal to Celtic move
Celtic linked with Peterborough's Harley Mills as Tilio wins silverware in Australia
Postecoglou was a massive success at Celtic, winning five major honours in under two years at the club, following his move from the J1 League at Yokahama.
He arrived at the club following the 2020/21 season and immediately implemented an attacking, forward-thinking brand of football to Glasgow.