Piraeus - Olympiakos have signed German midfielder Marko Marin from Chelsea for an undisclosed fee, the Greek champions announced on Tuesday.
While the club did not announce the duration of the contract, Greek media reported it was a three-year deal.
Marin, 27, had been with Chelsea since 2012, but only made six Premier League appearances, before spending loan spells at Sevilla, Fiorentina, Anderlecht, Trabzonspor and Borussia Moenchengladbach.
He has played 16 times for the Germany national side, scoring one goal.
"I am very pleased and proud to wear the Olympiakos jersey," Marin said.
"I will try to help the team reach their goal to win the championship and to do well in the Europa League."