He represented Australia's under-16 side against Pakistan in a twelve-match series, and he went on to play state cricket for Victoria's under-17 and under-19 teams.
In 2017, Murphy moved to the forward line and attracted attention from recruiters after kicking seven goals in a match against Geelong Grammar School.
[3] Murphy was listed with TAC Cup club Sandringham Dragons, averaging 16 disposals in eight games playing as a midfielder and a forward.
Australian cricketer Shane Warne rang Collingwood president Eddie McGuire to commend the decision.
[5] Commenting on his selection, Murphy said, "To land at a club like Collingwood so that I can stay home with the family, it's the best possible outcome.
[9] Murphy made his AFL debut in the round 22 match against Port Adelaide at the Melbourne Cricket Ground.
In April 2024, during the beginning of the 2024 AFL season, Murphy announced his retirement following advice from the medical concussion panel.
[12] Collingwood paid out the remainder of his 2024 and 2025 contract in full to alleviate any immediate financial concerns as well as offering him an internal non-playing role within the club.