The 27-year-old moved to Stamford Bridge from Marseille in 2016 but has been regularly loaned out to other clubs.
Michy Batshuayi spent time on loan at Borussia Dortmund and Valencia, before two spells at Crystal Palace, with the Belgium international now heading to Turkey.
However, he has also scored 25 goals in 77 Chelsea appearances, including one which clinched the Premier League title at West Brom in May 2017.
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