[3] He made his debut in the twenty-six point win against North Melbourne in round 10, 2016 at the Sydney Cricket Ground.

Marsh's maternal grandfather, Ray Sorrell, was a champion centreman for the East Fremantle team, based in Perth.

Marsh's younger brother Jonathon is also a football player who began playing for Collingwood in 2015.

[6][7] Marsh, who is 189 cm tall and weighs 87 kg, has played for the Sydney Swans since 2013,[8] after being selected with 44th pick in the 2012 NAB AFL draft.

"[10] He was delisted at the end of the 2015 season[11] because it was felt that "his style of game was too 'safe,' that he needed to play with a bit more adventure."

He was aided by player Rhyce Shaw, who "helped Marsh find the right balance between attack and defence.