Roy Hodgson, for now, has put any plans for Sako beyond June to the back of the queue in terms of priority.
"I think that's a matter for future discussion of course. It will depend not just upon myself," he told the Croydon Advertiser.
"I'm afraid I can't shed any light on that at the moment. And you'll have to forgive me, there are many more fish to fry as far as Crystal Palace is concerned at the moment.
"Mainly can we get a competitive team on the field of play, can we win enough points to keep in the league?
"I'm afraid thing like a new contract for a player who is out of contract and injured will have to be put, for me at least, on the back boiler for a week or two."