The veteran struck a superb hat-trick in yesterday's 3-3 draw with Sampdoria.
The 36-year-old had announced a few months ago that he would hang up his boots at the end of the season, but he declared: "I am having fun, now I want to go on vacation with my wife after two charity games.
"It's a shame the season is ending now, as I am in good physical shape and enjoying myself, but we'll see, I'll try to continue. I hope to continue.
"At the start the whole team struggled to do what we'd been able to in three years together, but I got 17 goals in the end."
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