Galatasaray have parted company with head coach Hamza Hamzaoglu despite him leading the club to the domestic double last season.
Hamzaoglu took over from Cesare Prandelli in November 2014, initially until the end of the campaign.
However, the former assistant manager of Turkey was rewarded with a long-term contract extension after winning both the league and the cup.
He also steered the team to the Turkish Super Cup at the start of this season.
"Galatasaray football team and Hamza Hamzaoglu have mutually agreed to terminate his contract. We want to thank our former manager for his services to the club and wish him all the best in the future," the club said in a statement.
Galatasaray sit third in the Turkish Super Lig, five points behind leaders Besiktas.
They remain in the running to reach the knockout stages in the Champions League, though they have just won once in four outings in Group C.
Hamzaoglu was also a league champion with Galatasaray twice in his playing career.
‘Scoring five goals in nine minutes is an epic thing. Someone cleared another chance off the line and I was a bit angry afterwards – I could have had six!’: Robert Lewandowski bemoans failing to hit double hat-trick while at Bayern Munich
‘Ruben is no miracle-maker. This year will be complicated and fans need to be patient, but he’s a perfectionist. He’s amazing at understanding players’ minds’: Manchester United manager will need time to implement ideas, says Amorim's former player
