Harry Kewell has left Celtic to become head coach of Japanese side Yokohama F. Marinos, with Adam Sadler replacing him in Brendan Rodgers’ backroom staff.

Kewell, the former Liverpool and Leeds forward, was brought in as first-team coach at Parkhead by ex-Celtic boss Ange Postecoglou in June 2022 – his first job back in football since being sacked as Barnet manager the previous September.

“I would like to thank Celtic for giving me such a wonderful opportunity to be part of one of the world’s great football clubs,” the 45-year-old Australian wrote on Instagram.

“It has been an absolute privilege to work with Celtic with two great managers in Brendan and Ange. It has been an honour to be part of such a fantastic institution and it is a time in my career and life, which I will never forget.

“I would like to thank everyone at the club and all the fans who have given me and the team such brilliant support.

“I would also like to thank Brendan for giving me such support in pursuing this new opportunity. It is a very difficult decision to leave Celtic but I feel the management opportunity presented to me is one I would like to pursue.

“I will always be a Celtic supporter and I will always wish nothing but the very best for the club. I hope the club and our supporters can enjoy more and more success.”

Kewell told his new club’s website: “I am incredibly proud and excited to represent Yokohama F. Marinos.

“I would like to thank the club for putting their trust in me to take the team forward. There is a lot of work ahead of us, and I am eager to get onto the training ground to start working with the players.

“We will work together as we aim to bring success to the club. The hard work begins now.”

Sadler was first-team coach at Leicester from 2018 until this summer, working closely with former Foxes boss Rodgers.

“I am delighted to be joining Celtic,” the 44-year-old Englishman told the Hoops’ website.

“It is such an iconic club with such a brilliant history, a phenomenal fan-base and tremendous record of success.

“It goes without saying I am really looking forward to teaming up with Brendan again. We worked closely at Leicester City and enjoyed some good times.

“I know exactly the way Brendan likes to play and what he demands from his players and staff, so I am sure once again we can work together and achieve really positive results.”

Rodgers added: “I am really pleased to welcome Adam to Celtic. He will be a fantastic addition to our coaching team and I know he will bring some great experience and ability to add to the club.

“I would also like to wish Harry all the very best for the future. I really enjoyed working with him, I thank him for all his work and I am sure he will enjoy the great opportunity he has been given in Japan.”