The German midfielder moved to Chelsea last summer from Werder Bremen but has struggled for playing time.
With Andre Schurrle joining Chelsea from Bayer Leverkusen, Marin was likely to get even less playing time this coming season.
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Chelsea legend Didier Drogba has revealed his top 11 Chelsea career moments during his recent interview on Chelsea TV.
The start of the 2017-18 Premier League season is just around the corner and is shaping up to be one of the most competitive yet.