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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Summer 2016 is set to be a very exciting time for football fans, as this is when the long awaited Euro 2016 tournament kicks off.
Since Guus Hiddink arrived at the helm, Chelsea have improved considerably after a tricky start to the campaign.