The Australian was furious with his club after their 2-0 loss to Manchester City.
While Postecoglou felt they performed decently in the game, he felt the club's mentality going into the game was all wrong.
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Many in the stadium were hoping their team would lose, given it helps City pip Arsenal to the Premier League.
Per The Athletic, Postecoglou was upset at several staff members being relaxed about losing the game.
He was even told by someone at the club in a joking way that he should field the reserves or youth team in the game.