Celtic have confirmed that Ange Postecoglou has left the club after Tottenham Hotspur announced the Australian is set to become their new boss.
The former Hoops manager's departure comes just days after winning the Scottish Cup and clinching the treble.
It also comes just days after he claimed he hadn't had any conversations with Tottenham.
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Postecoglou has signed a four-year contract with Spurs and will look to rebuild the London club and achieve success as he did with Celtic.
Celtic said the process of appointing Postecoglou's successor is "already under way", and said they hope to announce the new appointment "as soon as possible".
Postecoglou said: “I would like to sincerely thank everyone at the Club for everything they have given me. In particular, Dermot, Peter and Michael and the Celtic Board have shown me tremendous support in every aspect of my time at Celtic and I will forever be grateful for this.
"They brought me to the Club and I have worked so closely and so well with them for the past two years, I will always have a special relationship with them.
“They wanted me to extend my time at Celtic and while I am so respectful and understanding of their position, a new opportunity has been presented to me and it is one which I wanted to explore.
“It was an honour to be asked to be Celtic manager and during my two years I have given everything I have to deliver success to our supporters. Culminating in the Treble at the weekend, my players and backroom team have been brilliant for me on this journey.
"They have given us all some fantastic moments through their energy and effort, creating real quality, winning football.
“Our supporters have been magnificent to me and I thank them for the way they have embraced me during the past two years. My ambition was always to give our fans a team they could be proud of, a team people talked about and I think we have achieved that.
“Celtic is a phenomenal football club, and so much more - and I will forever be a supporter of this great institution. I wish everyone connected with Celtic nothing but continued success.”
Celtic Captain Callum McGregor says Postecoglou helped deliver "something special" to fans with last season's trophy treble.
He said: “It has been great to work with the gaffer over the past two seasons and to achieve the success that we have, especially achieving yet another Treble at the weekend.
“In fact, to win five out of six domestic trophies is a tremendous achievement and that is testament to the real focus and relentlessness of the manager, the players and our whole backroom team who have all worked so hard.
“I thank all our supporters again for what they have given us this year. The scenes at Hampden and Celtic Park, when we celebrated our success together will stay with me forever.
“We have delivered something very special to our fans and done it, under the manager’s direction by playing an exciting and attractive brand of football. As all the players do, I wish Ange great success in his next challenge.
“We move on ourselves to our own challenges too. Our performances this season mean we will take our place deservedly in the Champions League and we can’t wait for it.
"It will be brilliant to have these great nights back at Celtic Park and I am sure our fans are looking forward to experiencing this again, as well as watching us striving to defend all our domestic titles.
“The players will enjoy a well-earned break and when we return we will get right behind the new manager, we will be united and, as ever, will do all we can to bring our fans continued success.”
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