Guardiola has hinted the midfielder's style doesn't fit his system.
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Before victory in the Community Shield, Guardiola said: "He is a central midfielder but I said many times Kalvin likes to see all the game in front of him.
"When he is in the middle surrounded by players he struggles a little bit but he helped us a lot in the last couple of games on tour. I should have seen that before.
"His confidence is back."