Zaha missed out on the Carabao Cup defeat to Middlesbrough.
Palace lost the game 1-0, continuing a trend of being unable to win without their talisman.
But boss Roy Hodgson said he should be okay for the next game.
"He was fine the last time I saw him," said Hodgson after the game.
"He took a bang on the shoulder at the weekend which will be fine by the Chelsea game. It would have been difficult to play him [against Middlesbrough] with that knock anyway, but I spoke to him yesterday and he said he was fine."