Tottenham Hotspur duo William Gallas and Sandro have suffered calf tears, prompting fears that the pair could be sidelined for a lengthy spell.
Both players picked up the injuries in Spurs' 1-0 win over West Bromwich Albion at White Hart Lane on Tuesday.
"They both have tears," said Redknapp. "It's difficult to know how long they will be out for."
Gallas and Sandro join a list of casualties which include Scott Parker and Ledley King.