Chelsea star Juan Mata has no doubts David De Gea will prove a success at Manchester United.
Despite early criticism Mata has no doubts about his quality.
Mata said: "Don't worry about him. He is a very calm player, much calmer than a player normally would be at that age.
"One of his best qualities is he doesn't get distressed. He keeps calm and has excellent technique."
Click here to reach the No1 destination for hard news and exciting gossip on Manchester United