Maybe of some interest, here's a link to a 20 page research, published in the International Review for the Sociology of Sport.
Probably a few years old.
Based on extracts from a series of interviews with northern nationalist players, the study situates their lived experiences within the broader socio-political landscape of
Northern Ireland, highlighting a range of factors from the perceived culpability of the Irish
Football Association (IFA) to sporting pragmatism on the part of the players.
Interviews with Eugene Ferry, Patrick McEleney, Shane McEleney, Patrick McCourt, Niall McGinn and Michael Gault
Narratives of northern nationalist footballers in NI