Keane, from Stockport, has enjoyed a meteoric rise in the last 12 months that has seen him break into the reserve team at Old Trafford just a year after leaving St Bede's College to join United's academy.
Capello personally requested a DVD of England's opening game at the UEFA Under-17 Championships to watch during World Cup preparations at their training base in Irdning, Austria, which featured Keane.
Head of football at St Bede's College, Steve Fallon, told the Manchester Evening News: "Will has had a fantastic year at United and everyone at the college is delighted to see him making such excellent progress.
"I have been tracking his progress and I have seen him score some stunning goals.
"As a lifelong United fan I cannot wait to see him in the first team."
Proud dad Aidan said: "We are absolutely thrilled that Will won the Young Player of the Year award.
"He was nominated alongside two other second year academy players so to win the award at such a young age was a major achievement."