He told reporters: “I think after he came back after his injury, he did extremely well, with a very good performance against West Ham.
“In the last two games, he had some weaker moments, both against Southampton and when we conceded the goal against Burnley.
“He is our captain, and I don’t see any reason to change that, but he is a player who has to develop and get better, like all the other players.
“The way we play is new. In the English national team he is used to playing in a back three, here he’s in a back four but not as proactive. It will take some time for him to get used to it.”