Redknapp says, like with the world's other top stars, the Wales international must cope with over-zealous defending.
He said: "The last tackle (from Simon Cox) at the end of the West Brom game, that was bad and from behind when he was running away, that was cynical.
"But he is so quick and can just move the ball away, people lunge in and suddenly the ball is not there and they catch him. I suppose when you are that good a player you are going that.
"The top players in the world - [Cristiano] Ronaldo and [Lionel] Messi - who can run at people with the ball and beat people all get that. 'He has got quick feet and is maybe a little bit too quick for the people he is playing against."