Crouch has been linked with a move to Stoke City, but Redknapp does not want to see the striker leave.
"I don't know what the latest situation is with Crouchy," the 64-year-old said.
"People say we want to sell Crouch to Stoke and it's in the papers every day. Crouchy has to play under that. It's very difficult.
"As far as I know he is staying."