Club

Upon being reappointed Donegal Gaelic football manager in 2017, Declan Bonner set about trying to recruit Patton.^[4] The goalkeeper had never before played a local league or championship game in the sport of Gaelic football, only appearing for St Eunan's in two Ulster club games against Roslea and Omagh during the 2014–15 All-Ireland Senior Club Football Championship.^[4][12][13] At the time of Bonner's request, Patton was negotiating the possibility of joining soccer outfit Cork City.^[4] He was doing so from a position of having played for one year for Sligo Rovers — where he deputised for Micheál Schlingermann when Schlingermann was injured — and had started 12 games for the Sligo soccer outfit in 2017.^[1] Patton said at the time:

"I've committed to the Donegal panel for the foreseeable future. I had offers from two [League of Ireland] clubs and I was chatting with some others, but I've decided that the GAA is the best option for me at the moment. Eventually the chance to play for Donegal was going to stop presenting itself. Now is the right time".^[1]

Patton won the 2021 Donegal Senior Football Championship with his club, scoring one point (from a '45) in the final.^[14]

Inter-county

Patton began training with Donegal for the first time in January 2018.^[1] He had fractured his ankle the previous October while playing for the Sligo soccer team against an outfit from Drogheda.^[1] Under the management of Declan Bonner (second spell), Mark Anthony McGinley was initially the first choice goalkeeper, having been brought in by Bonner's predecessor Rory Gallagher. However, during the opening fixture of the 2018 National Football League against Kerry, McGinley sustained an injury and second choice goalkeeper Peter Boyle came on as a substitute.^[15] Boyle then started against Galway in the second league fixture,^[16] and again started in the third fixture against Dublin (at Croke Park).^[17] Then, in the fourth league fixture against Kildare, manager Declan Bonner opted for Patton as Donegal's first choice goalkeeper, prompting Boyle to quit.^{[18][19][20][21]}

Patton continued in goal for the remainder of the season. He made his Ulster Senior Football Championship championship debut from the start against Cavan, and played every minute against Derry and Down on the way to the final against Fermanagh, which Donegal won.^{[22][23][24][25]} He then played every minute of Donegal's 2018 All-Ireland challenge, making his Croke Park debut against Dublin in the quarter-final group stage on 14 July 2018, only for Donegal's challenge to come undone against eventual finalists Tyrone.^[26][27][28]

Patton started the opening game of the National Football League,^[29] before briefly alternating with McGinley,^[30][31][32] until taking over completely as Donegal's first choice goalkeeper when McGinley withdrew from consideration in March due to his reluctance to commit in the competition against Patton.^{[33][34][35][36][37]}

Patton won his second Ulster Senior Football Championship later that year, again completing every minute of play.^[38][39][40] He did so while competing against Paul Durcan (regarded as having the sport's closest ability in the goalkeeping position to Stephen Cluxton); Durcan had availed of McGinley's departure to seek a return to Donegal.^[4][41]