Loughman joined Munster on a three-month development contract in December 2017, having previously been a member of the Leinster Academy. He made his first appearance for Munster A on 8 December 2017, featuring off the bench in the provinces' 25–14 defeat against Bedford Blues in the 2017–18 British and Irish Cup. He made his debut for Munster on 1 January 2018, coming on as a replacement for James Cronin in the 2017–18 Pro14 fixture against Ulster. Loughman's contract was extended until the end of the 2017–18 season in April 2018, before being extended again for the whole of the 2018–19 season.