Capped at youth level by Republic of Ireland, the youngster is one of a number of players to head across the Irish Sea to represent United's Academy.
The defender 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.
After being eased in gently for the Under-18s, he ended the season with four appearances, three as a starter, but he seems certain to be involved more regularly this term. Indeed, he is starting to become a permanent fixture in the centre of defence with his organisation and strong tackling catching the eye.