The report claims that Trabzonspor have reached an agreement with Chelsea and the player.
Fanatik previously reported that Trabzonspor were preparing a €2.5 million bid for the Chelsea winger.
Marin is expected to put pen-to-paper after completing a medical in Turkey.
The club have yet to confirm the transfer but sporting director Süleyman Hurma recently stated that the club would be making up to three more transfers before the end of the window.
The 26-year-old winger has struggled for playing time at Chelsea but still has another two-years left on his current contract.
Marin was signed on an €8 million move from Werder Bremen in 2012 but his Chelsea career never really took off.
The Germany international has been loaned out to Sevilla, Fiorentina and most recently Anderlecht over the past three seasons.