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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Liverpool have unveiled their new home kit for next season, sticking with the hugely popular retro styling of the current shirt.
The reputation of the Premier League means it is the most popular and one of the most watched leagues in the world.