Originally a left-back with Southampton, Redknapp pushed him further forward and was at the helm when he won the Professional Footballers Association Player of the Year award for the first time in 2011, a feat he repeated last season.
"He has been playing like that for three or four years," he said. "I think it was three years ago that he was Player of the Year the first time.
"He has been consistent over a period of about four seasons so he has proved he can do it regularly, every year.
"He has got everything, he can do the whole lot - he can dribble, he can shoot with both feet, can head it, run all day, run at speed. There is nothing he can't do. He is an amazing player."