O’Driscoll impressed at the 2018 U16 Championships for Western Australia with his performances across half-back, earning him All Australian selection. The signing means Fremantle now have two O’Driscolls at the club, with older sister Emma a defender for Freo’s AFLW team. O’Driscoll transitioned into more of a midfield role in his bottom-age year and his great form continued with an outstanding 2019 season for Perth in the WAFL colts. He led the competition in ground ball gets per game (13.6), while also averaging the second most contested possessions (16.3 per game), the second most tackles (7.9 per game) and the third most clearances (7.8 per game). His bottom-age year was capped off with selection for Western Australia in the U18 Championships, playing three of a possible four games as WA went on to win the championship. An ankle injury and the Covid break meant an interrupted start to O’Driscoll's 2020 season, but he still performed well enough upon his return to progress from the colts through to the league side, keeping his place in the side for Perth's finals campaign, playing through the midfield and on a wing. O’Driscoll is a very impressive athlete and this was evident at the WA state combine, where he recorded 2.93 seconds for the 20m sprint, 8.12 for the agility test and 6:23 for the 2km time trial. The 18-year-old combines these athletic attributes with an almost unparalleled in-game work-rate, impressive ability overhead and has intent to tackle and pressure.