The United manager said: "Don’t compare, I don’t think it is right. They all have their own identity but for Garnacho to go that way he has a lot to come, he has to work very hard. You have to do it on a consistent basis and so far he has not.
"But he definitely has high potential to do some amazing things, it's not the first time we saw this, we have already often seen glimpses but if you want to be a player like Rooney or Ronaldo you have to score 20, 25 goals in the Premier League each season. That's not easy to get, you have to work hard, you have to go in areas where it hurts. So a lot to come. But he has potential."