[1] In his late teenage years he played representative football for the junior side of South Adelaide Football Club, as well as five reserves grade matches in 2021.
[1][2] He continued to play SFL football with Port Noarlunga in 2022, before suffering a season-ending ankle injury after just three matches.
[3] During the year he also made one appearance for the Happy Valley Football Club in the SFL.
[1] Prior to the mid-season AFL draft, Coulthard had played three senior matches for Glenelg.
[4][5] He did so as the starting substitute, recording seven disposals in just 30 per cent game time.