Naoki Naruo, who on Tuesday was crowned S-League Coach of the Year, has left league champions Albirex Niigata.
The 42-year-old led the Japanese club to an unprecedented four trophies this season. They won the S-League, Singapore Cup, League Cup and the Community Shield.
Albirex vice-chairman and general manager Koh Mui Tee said the Iwate native wants to return to Japan to spend time with his family.
A post on the club's website said Naruo is leaving "upon completion of his contract". In the same post, Naruo, who was in charge of Albirex for a year in 2009, said: "When I was approached in December last year to be the head coach again, I looked at the recent history of the club. It was apparent to me that the target was to win the league title, which has been eluded the club.
"It was a very clear objective and an attractive proposition... I told myself that I cannot afford to fail again at this second bite at the cherry.
"I want to thank my players and coaches, office staff who believed in my methods. I also want to thank the sponsors and supporters for the fervent support we received."
Yesterday, the White Swans also announced a new outreach programme. From next year, they plan to have two school footballers from Yuhua constituency attached to Albirex's parent club in Niigata each year for week-long training.
Chua Siang Yee