The son of Ben Marsh, who played 48 games for Adelaide between 1998 and 2003, Marsh was taken at pick 22 in the 2025 national draft. The West Adelaide key forward kicked 30 goals in 15 under-18 games that year and another 12 for South Australia at the national carnival, and finished top 10 in the 2km time trial at the draft combine. He is yet to play a senior AFL game.