Reina is on a season-long loan at the San Paolo.
"I'm happy to be back at this level. I never expected it, but it's been a great decision. I feel invigorated by the move," he told the Daily Mail.
"Mentally, I'm fresher, I have more hunger. It is not like before I wasn't, but a change can be good for your mind. You have to show the people even more and you have to be ready. The tactics and the managerial skills of Rafa Benitez are getting the best from me and that's one more reason."
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