But he says it's soon to draw comparisons between eachother.
"It's not time for that or for any other comparisons. Varane is very good, he's magnificent and he's got it all," Hierro told Marca.
"He's a player with good ball control, good positioning and he's very fast. He's also strong in the air in both boxes.
"But he must be left to grow, so he can be taken care of, creating the ideal environment for him to develop and show what he's got.
"Flaws? It would be strange if he didn't have anything that needed correcting at the age of 19. Varane is equally good now as he was before having played against Barcelona."