Date of birth
The teenage goalkeeper penned a two-year professional contract – with the option of a further 12 months – at Turf Moor in August 2018.
Manchester-born McMahon grew up in Hull and had a spell at Hull City after starting out in the youth set-up at York City.
The Republic of Ireland youth international then completed a two-year scholarship at Rotherham, making it as far as the bench for a third-round FA Cup tie in January, 2017.
McMahon made a number of appearances for the Clarets' Under-23s before joining National League North side Ashton United on loan for the remainder of the season in January, 2019.