Reports suggest United have forked out £18m for the young keeper, who has just won the U-21 Euro Championships.
“I feel very proud and I can’t wait to start playing here,” De Gea said to MUTV. “When a club the size of Manchester United comes in for you it obviously makes you very, very happy. I saw their interest as an extra motivation to work even harder to show off my ability. It’s a great privilege to be part of a club like United and I’m keen to do my best and show what I can do.”