The London Evening Standard says Palace co-owner Stephen Browett says Zaha's England call-up has strengthened the club's resolve that their star man is not for sale in January.
"We absolutely do not want to sell Wilfried in January," said Browett, who owns the club with fellow consortium members Steve Parish, Martin Long and Jeremy Hosking. "If you finish bottom of the Premier League you get £60million in prize money, and with parachute payments over four years you're guaranteed £100m.
"It is such a massive amount that selling your best player when you have a good chance of promotion makes no sense at all. The figure of £20m has been talked about and that lets clubs know we are serious but he is not for sale."