Niko Kranjcar will miss the rest of the season after suffering ligament damage to his right ankle in last Sunday's FA Cup semi-final against Portsmouth.
"We had used all our subs and he got a nasty tackle," said Harry Redknapp at today's press briefing. "We didn't know the damage he had done because he wouldn't come off and played on in extra time.
"As soon as he came into the changing room and took off his boot after you could see his ankle had come up like a balloon.
"How he played on with that ankle I will never know. The courage he showed was unbelievable."
The Croatia international will undergo an examination of the ankle under anaesthetic on Monday to determine the extent of the injury and future treatment.