Morahan is a native of Leitrim village, County Leitrim and began playing football with Carrick Town and then Strand Celtic, before undergoing a successful trial with the academy of League of Ireland club Sligo Rovers in 2015.
[2][3] On 18 August 2018, Morahan made his senior debut for Sligo Rovers, replacing Kris Twardek from the bench in injury time of a 3–1 win away to Limerick at the Markets Field.
[4] He made 4 further appearances in 2018, before impressing in pre-season[5] and becoming a first team regular during the 2019 season, featuring 27 times in all competitions during the year.
[7] In July 2021, Morahan made the first European appearances of his career, when Sligo faced FH of Iceland in the UEFA Europa Conference League.
[15] On 14 November 2024, Morahan signed for League of Ireland Premier Division club Bohemians ahead of their 2025 season.