Former West Ham defender Slaven Bilic will leave his role as Besiktas manager at the end of the season.
The 46-year-old, who is reportedly favourite to replace Sam Allardyce at Upton Park, has been in charge of the Turkish side since 2013.
"I won't be Besiktas's manager next season," said Bilic. "I'm proud of what I've done here."
West Ham confirmed on Sunday that Allardyce would not be manager next season.
Ex-Croatia international Bilic spent just over a year at the Hammers from 1996.
Since retiring as a player, he spent six years in charge of the Croatia national side before a spell at Lokomotiv Moscow.
He failed to guide Besiktas to the Turkish league title in his two years at the club and Sunday's 2-0 defeat to Galatasaray meant they missed out on Champions League qualification for next season.
"As I said before, I am the first one who is going to take responsibility for not winning the league for two years," he added. "I have already made my decision."