Born in Macclesfield, Cheshire, Amos joined Manchester United at the age of 11, signing shortly after leaving Crewe Alexandra. He made his first appearance for the Manchester United under-18 side on 8 October 2005, coming on as a substitute for Daniel Rose after starting goalkeeper Ron-Robert Zieler was sent off in a 2-0 defeat to Bolton Wanderers. He was regularly named as an unused substitute during the 2005-2006 season, but became a regular starter for the team in 2006-2007 after signing a trainee contract in July 2006.

He retained his place in the under-18 team for 2007-2008 and impressed enough to be taken on the club's 2008 summer tour of South Africa.

On 14 December 2008, Amos travelled to Japan with the Manchester United squad for the 2008 FIFA Club World Cup, having been called up as a late replacement for Ben Foster, who had picked up a hand injury in training.

Following the departure of Ben Foster from Manchester United to Birmingham City, Alex Ferguson declared that Amos would be Manchester United's third-choice goalkeeper for the 2010-2011 season behind Edwin van der Sar and Tomasz Kuszczak.

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