Willian passed his medical in Piraeus before signing a one-year contract with the reigning Europa Conference League winners. Apart from Willian, Jose Luis Mendilibar is eager to bolster his squad with further reinforcements and has been linked with another former Chelsea player, Hakim Ziyech. The Moroccan winger, currently with Galatasaray, is reportedly looking for a move away from the Turkish club, and Olympiacos could be a potential destination.