[2] In the semi-final of the Hogan Cup against Summerhill College from Sligo, McGuigan top-scored with 1–8, including the winning free in injury time, to send his team into the final.
[3] On 2 April, McGuigan was at full forward against St Brendan's College, Killarney in the Hogan Cup final at Croke Park.
McGuigan finished with a personal tally of 1–3, but two late goals from David Clifford gave St Brendan's the win.
[6] McGuigan joined the Slaughtneil senior football team in 2015, having been a water-boy for the club's All-Ireland final loss to Corofin on St Patrick's Day.
[7] On 5 October, McGuigan played in his first county final, coming on as a substitute in Slaughtneil's one-point win over Eoghan Rua, Coleraine.
[8] On 16 October 2016, McGuigan started a county final for the first time, scoring 1–1 in Slaughtneil's comfortable win over Loup.
[12] On 24 September 2017, McGuigan scored 2–4 in the county final win over Ballinascreen as Slaughtneil claimed their fourth title in a row.
[19] On 11 September 2016, McGuigan played in his first county hurling final, lining out at wing back in Slaughtneil's ten-point win over Banagher.
[20] On 23 October, Slaughtneil became the first Derry club to win the Ulster title, beating Loughgiel Shamrocks by four points in the final.
[25] McGuigan scored a point as Slaughtneil beat Banagher once again to win their sixth successive championship title on 30 September 2018.
[31] On 19 December 2021, Slaughtneil won their fourth Ulster title, McGuigan scoring a point in the final win over Ballycran.
[33] On 25 September 2022, McGuigan scored four points as Slaughtneil beat Kevin Lynch's once again to win their tenth county championship in a row.
McGuigan scored a point, but received a black card early in the second half, and Donegal ran out comfortable winners.
[40] On 26 July, McGuigan was in the half back line as the Derry under-21 hurling team faced Down in the Ulster final, scoring a point in the 3–17 to 1–9 win.
[44] On 30 March 2019, McGuigan was at corner forward for the National League Division 4 final against Leitrim, scoring six points in the four-point win.
[60] In the Ulster Championship, McGuigan scored 2–5 against Fermanagh,[61] and nine points against Monaghan as Derry reached back-to-back provincial finals.
[63] On 16 July, McGuigan scored six points as Derry lost the All-Ireland semi-final to defending champions Kerry.