The 21-year-old is convinced he will remain at Old Trafford for ‘many years’.
“I have every intention of spending many years at Manchester United,” said the Spaniard.
“I want to go on to become a great United keeper and to earn and deserve respect. I want to help United make history.”
He added: “I think it is fair to say La Liga and the Premier League are the two best leagues in the world.
“But it’s well known the style of play here is rather more physical and, as a goalkeeper, you have to be right on it. You have to be attentive all through the match.
“The players coming at you can shoot from any angle and from distance. You need to be aware you might get a shot from distance at any time.
“Having said that, there’s a lot of crosses from the sides, a lot of high balls and aerial play. So you have to be able to get in there and block, interfere and stop shots being taken.
“I knew when I was coming to United this was the style of play. So I was pretty much ready and I was already confident.”
