[4] He earned him trials with Wolverhampton Wanderers, Leeds United, Preston North End in soccer's English Football League.
A prominent part of the inter-county teams of the Jim McGuinness era, McGlynn won his first Ulster Senior Football Championship winners' medal with Donegal on 17 July 2011, becoming the first man from the Glenfin club to achieve this.
[8][9] He had a terrific game on 22 July 2012 as Donegal retained the Ulster title for the first time in their history with a 2–18 to 0–13 victory over Down.
[15] Coming in the 2013 Ulster Senior Football Championship, McGlynn was concussed, as was teammate Ryan Bradley, causing manager McGuinness to voice fears that one of his players would receive a spinal injury or a neck injury if the "'dangerous' levels of physicality in the GAA" continued.
[18] Under the management of Rory Gallagher, McGlynn started the opening fixture of the 2015 National Football League at home to Derry.
[26] He had previously started the preliminary round against Tyrone (scoring 0–1), the quarter-final against Armagh and the semi-final against Derry.
[27][28][29] McGlynn started the 2015 All-Ireland Senior Football Championship qualifier defeat of Galway at Croke Park and the next game against Mayo at the same venue.
[38][39][40] McGlynn scored 0–1 in the 2016 All-Ireland Senior Football Championship qualifier defeat of Cork at Croke Park and also started the next game against Dublin at the same venue.
[47][48] McGlynn started the 2017 Ulster Senior Football Championship quarter-final victory against Antrim (scoring 0–1) and the semi-final loss to Tyrone.
[51][52] Under the management of Declan Bonner, McGlynn played only in the final two games of the 2018 National Football League, against Monaghan and Mayo (both of which he started).
[56][57][58] Not featuring until the final round of the 2019 National Football League, he came on as a second-half substitute in the victory over Kildare.