Rennes midfielder M'Vila has 22 caps for France and was part of their Euro 2012 squad but he is serving a two-year ban from international duty after he and four other players in the Under 21 squad went on an unauthorised night out in November.
Redknapp said: "He is a top, proper footballer. He can play. He controls the game, he can pass the ball, he is strong.
"He's had a few problems off the field but he is only young. If he behaves himself and comes and plays for us as he is able to then he will be a great asset."