The Argentine goalkeeper comes off contract in June.
He said: "During my time here I am used to different managers arriving and other goalkeepers coming in. I've always seen that as a challenge and I've always kept my place in the side.
"This is no different. I'm happy with my form this season - I have felt better and better than ever. I have a good few years left in me.
"Hopefully that will be with Palace and everything will be tied up soon. I'm settled here so I don't want to go anywhere else."
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