Former Real Betis sports chief Antonio Cordon has taken charge of Olympiakos.
Cordon resigned from Betis earlier this year feeling his role had run it's course.
He has now been appointed at Olympiakos, after being linked with Barcelona and Aston Villa.
Olympiakos, which finished in third position this season in Greece, will have to play a qualifier this summer to reach the group stage of the Europa League.