The Spaniard joined United as a 20-year-old and has since gone on to make 487 appearances for the club.
Now 31, De Gea has explained how difficult it was adapting to life in England.
"I was 19-20 [when I moved to Manchester] and I came with my mum and dad so my English was really bad at the beginning," De Gea told United Daily. "It was very tough for me.
"Everything was different to when I was in Spain - different people and better players here so it was tough at the beginning.
"Step by step I was learning my English, talking more with the players and now that I am here it is like my home."
And De Gea revealed he even misses Manchester when he returns to Spain.
"It is like my proper home now," he added.
"Even when I am in Madrid for holidays or something, I am missing my house and people here. It is great to be here and to be a part of the history of this club is amazing and it is a privilege to be here."