Sam Johnstone continues to develop into one of England's most promising goalkeepers.
The youngster was between the posts when United lifted the FA Youth Cup in 2011 and has since proved himself at league level during three loan spells in the lower divisions.
Following stints with Oldham Athletic and Scunthorpe United, he ended the 2012/2013 campaign at Walsall and was a key figure as the Saddlers were unlucky not to reach the League One play-offs.
"He's not the young boy that David De Gea saw two years ago anymore," former goalkeeping coach Eric Steele told ManUtd.com. "We are very fortunate that we can carry four senior goalkeepers.
"When Ben Amos came back from Hull, we let Sam go to Walsall and it was great experience for him. I saw his debut at Hartlepool on the coldest day of the year – it was minus six or something and he was wearing tights, which I need to mention! I couldn’t believe it but he had to because it was that cold.
"What a great education for him, it was his debut and he was tested out in the first 20 minutes