The former Real Madrid stopper made the move last summer.
"I'm really settling in well here. I'm want to try and be the best player I can possibly be, and help Napoli win.
"Benitez was an important part of me coming here, and then Callejon and Higuain came as well.
"At the moment I am thinking about doing well with Napoli, but it is normal to be thinking about the World Cup."
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