Zaha has already scored more goals this season (12) than he has managed in any campaign in his second spell at Palace and Butland says the Ivory Coast international will be ready for the big occasion this weekend.
“Absolutely, he will be up for it, like we all will be," said Butland. "He is going to leave it all out there, which we all are.
“When Wilf does that, there are not many people in the world who can play like him or can stop him.
“I'm sure we will see the Wilf that we are seeing at the minute on Sunday. Wilf, along with the other incredible talents that we have got in the squad at the minute - we are a force to be reckoned with. It is not us playing Chelsea, they have got to play us as well.
“It will be a good occasion, and I am sure we are all going to bring it."