The 40 year-old retired footballer's points,
"You can't compare him, he is unique, he makes things look easy, his pace is frightening. His acceleration is unbelievable because of his ability to go through the gears in very little space.
Plus, he is very good technically which is also important, we must not forget that he plays football well.
He's really impressed me. I've seen him two or three times live, including recently at Lyon, which wasn't necessarily his best game, but where every time he got the ball he can surprise you.'
On whether the welshman who is reportedly joining Madrid next season is as good as Ronaldo or Lionel Messi, he said, "He's perhaps not quite at the level of the other two, but he's different. So personally I don't think he's far off."