The Republic of Ireland international is out of contract at Selhurst Park in the summer, but hopes to stick with the promotion-chasing Eagles.
The 28-year-old has bagged 14 goals so far this season, and wants to concentrate on scoring more while his new deal is sorted out.
"I'll let my agents sort that out and then we will decide at the end of the season what is the best thing for me to do," he told the Croydon Guardian.
"If the talks go well then obviously I'm going to sign at Palace.
"We're off for a month and a half in the summer so we can sort out the contract then. My main aim now is just to get Palace to the play-offs and to get us up to where we should be."