Scullion began his career in the youth academy of Hamilton Academical.
He joined Stenhousemuir on loan in 2019 and made his professional league debut on 3 August in a 3–2 defeat to Albion Rovers.
[1] Scullion had a loan spell at East Kilbride in 2020, before leaving the Accies that summer.
[4] His good form for the Hoose earned Scullion a move to Scottish Professional Football League side Clyde in 2022.
[5][6] He made his league debut for the Bully Wee on 30 July 2022 in a 4–1 win over Queen of the South.