Redknapp is set to partner Jonathan Woodgate and Ledley King against Manchester United in the Carling Cup final on Sunday.
“Dawson has been fantastic for me and done a great job,” said Redknapp.
“But when Ledley plays we seem to win. He played at Manchester City when we won, he played at West Ham when we won and at Hull when we won.
“You just wish you could get Ledley on the pitch more because when he plays he has a presence about him.
“Ledley’s a very important player to us, so we’ll have to see how he is for Sunday.”