Ange Postecoglou says his Celtic exit was part of the 'business' of football.
The Australian spent two successful years in charge at Parkhead, during which he won two Scottish Premiership titles, two Scottish League Cups and one Scottish Cup.
Postecoglou left Celtic for Tottenham Hotspur in the summer of 2023. He then subsequently spent two years in North London, winning the Europa League at the end of his second season before being sacked.
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Speaking at a press conference after recently being unveiled as Nottingham Forest's new manager, the 60-year-old opened up on his exits from Spurs, Celtic, and Yokohama F. Marinos.
He said: "I knew it [Spurs sacking] was coming, so it wasn't a surprise, that's one thing.
"How it ended, I don't really think about it a lot.
"To be fair, I've done it a couple of times myself. I left Celtic, and I'm sure they were disappointed. I left Yokohama, and they were disappointed. So you understand that that's part of the business we're in. That's okay.
"It's allowed me now to move into this, and maybe these things happen for a reason."
Postecoglou will take charge of his first game as Forest boss this Saturday as his side travel to face Arsenal in the English capital.