The veteran goalkeeper, 43, has declared he aims to sign a new deal for next term.
He told Sky Italia: "As long as I have the right level, I will continue. To continue? I measure the width and height of my jumps every week: as long as I see that they are going well, I continue ... as long as I have a good level, I continue to play, but as soon as I see that they go wrong, I am the first to stop.
"I do not achieve this goal by crawling, but by jumping more and that is the greatest satisfaction and pride that I have.
"It's the way you can do things to make a difference."
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