Crystal Palace boss Frank de Boer says he will not take risks with Wilfried Zaha as the winger begins rehabilitation on his injured knee.

"Wilf is a very robust player, the first couple of days (after the injury) are very important to have a rest and, from now on, I think he's going to start rehab," De Boer said.

"We don't know how long it will take.

"The risk is that you start too early, that he can have a setback, so we are going to see and don't put a time on it right now."

De Boer admits he wants to bring in reinforcements before September 1 transfer deadline, although he would not be drawn on specific names.

"We're looking very hard and if something happens you're (journalists) the first to hear it," he said.