The Spaniard said: “I think the expectations when we made the decision together to bring him to the football club, what he wanted to do coming here has not been fulfilled.
“It’s true that the context has not been the best for him. It’s been the most difficult year in football history for any football player.
“I think Willian is a player that needs to play happy, feel joy and feel the supporters and then express himself with the quality that he has.
“None of that has happened, the contrary as well. He found a difficult place for him and he’s not been comfortable with that and I think that’s why he’s struggled.”