Redknapp, who signed him for £5.5million from Arsenal in January, said: "When Diarra first came here people said he was a Makelele. He isn't a Makelele because he has another dimension to his game.
"He goes with the ball, beats people and surges. He has got everything. He is a player right up there with the best midfielders in the world.
"He is an unbelievable athlete, with amazing power and strength. And he can do amazing things with the ball."