Capped at youth level by Republic of Ireland, the defender is one of a number of players to head across the Irish Sea to represent United's Academy.
The full-back from Donegal impressed Reds scouts to earn a contract at Old Trafford and competed in the 2012 Milk Cup.
McConnell also started the opening game of the Under-18 season against Stoke City at Carrington and earned his first Under-19 call-up for his country in January 2013.