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.
Eurosport's Andreas Evagora examines the More »
Pitchside Europe - Fri, May 17, 2013 17:59 BSTMassimiliano Allegri's future as AC Milan coach More »
Pitchside Europe - Fri, May 17, 2013 17:48 BSTJim White has a sense of regret as he wonders why More »
Jim White - Fri, May 17, 2013 11:54 BSTOur experts from across Europe give their views More »
Pitchside Europe - Fri, May 17, 2013 09:04 BSTEarly Doors is in mourning but has pieced itself More »
Early Doors - Fri, May 17, 2013 07:12 BST