Chelsea attacking midfielder Marko Marin has left the club to join Olympiakos in Greece.
The 27-year-old played only 143 league minutes for the Blues and was loaned out to Sevilla, Fiorentina, Anderlecht and Trabzonspor in recent seasons.
He moved to Stamford Bridge from Werder Bremen for £6.5million in the summer of 2012 but has struggled to enjoy regular first-team football with the Londoners.
Speaking to Sport1 after signing for the Greeks, he said: "It's such a great feeling to sign for a club like Olympiakos.
"It's also nice to sign on a permanent deal."
The Blues are also expected to sell winger Juan Cuadrado on a permanent basis.
Juventus are confident of signing the Colombia international before the end of this week.