Zidane suggests Bale is a different kind of player to the other two and indicated that he feels the Welshman is not far off those exceptional talents.
"This year the player who has impressed me most is not actually playing in the Champions League," he told Sky Sports. "He is playing in 'the other cup' (Europa League), and that is Bale.
"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.
"He's perhaps not quite at the level of the other two [Ronaldo & Messi], but he's different. So personally I don't think he's far off."