The Macclesfield-born keeper has been capped by England at youth and Under-21 level.
He has worked his way through the Old Trafford ranks since the age of 11 and joined the club's academy in July 2006.
He quickly established himself in Paul McGuinness' Under-18s side in the 2006/07 campaign and made his reserves debut in November 2007.
Amos made his senior United bow against Middlesbrough in the League Cup in September 2008.

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