Ange Postecoglou has left Celtic.
The 57-year-old has joined Tottenham after only two years in Glasgow.
A club statement from Spurs read: "Now that the season and all domestic cup competitions have concluded, we are delighted to announce the appointment of Ange Postecoglou as our new First Team Head Coach. Becoming the first Australian to manage in the Premier League, Ange will join us on 1 July on a four-year contract."
Spurs chairman Daniel Levy added: “Ange brings a positive mentality and a fast, attacking style of play. He has a strong track record of developing players and an understanding of the importance of the link from the academy - everything that is important to our Club. We are excited to have Ange join us as we prepare for the season ahead."
Celtic also announced the news, saying: "Following the announcement today that Ange Postecoglou is to join Tottenham Hotspur FC, Celtic Football Club wishes him well for the future.
"The process of appointing Celtic’s next football manager is already underway. While we will aim to announce this appointment to supporters as soon as possible, our priority will be to appoint the best candidate to take the Club forward."
Celtic Chief Executive, Michael Nicholson said: “It has been a pleasure working with Ange, a great football manager and a good man. He has served the Club with such energy and determination and delivered a phenomenal level of success.
“I would like to thank him for all he has given us and I wish Ange and his family the very best for the future in everything they do.
“Of course, we wanted Ange to stay with us at Celtic and while there is real disappointment that we are losing him, he has decided he wants to look at a new challenge, which we respect.
“As Treble-winning champions, the Club looks ahead with confidence to the future, with many exciting opportunities ahead. The Club appreciates the tremendous support from Celtic fans this season and we will continue to build from this position of unity and strength.”
