Since moving from Atletico Madrid to the Premier League champions in 2011, the 22-year-old has cemented his place as first-choice goalkeeper after initially losing his starting berth twice to Anders Lindegaard.
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De Gea puts his success down to self-confidence and belief but has reserved special praise for the rest of the United squad.
"Everyone in the squad helps you a lot and the settling-in process is made a lot easier by the fact that there is such a warm atmosphere," he told the club's official website.
"At first, everything is new. The football, the culture and how people live - it's about learning how things work at the club and getting to know your team-mates. The support I have had from everyone at the club has been fantastic," he added.
