The Blues-owned goalkeeper is currently on-loan with Atletico Madrid.
Mourinho said: “No, we won’t struggle to keep him. He has two more years on his contract so he is easy to keep.
“The problem is when you want a player and the player belongs to another club.
“When you want a player and that player belongs to you and he has two more years on his contract, it is easy to say you have no problems.”
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