Celtic manager Ronny Deila insists Virgil van Dijk does not want to leave the Scottish Premiership leaders in January.
Celtic boss Ronny Deila says keeping his best players will take priority over acquisitions in the transfer window.
Newspaper reports suggested United boss Sir Alex Ferguson held talks with the player in London on Sunday over a switch that could be worth up to £15m.
But Palace have told Sky Sports they have not given Zaha permission to talk with the Premier League leaders and no deal has yet been struck.
Arsenal and Tottenham are among others said to have been tracking the 20-year-old's progress, although United remain favourites to land him.