Simpson made his AFL debut for Fremantle in round 7 of the 2024 AFL season at Perth Stadium against the Western Bulldogs.[3] Simpson started as the substitute but came into the game after quarter time for teammate Josh Draper, who suffered a hamstring injury.[4] Simpson maintained his spot for the following week's clash versus Richmond, this time making the starting 22. Simpson was replaced by Sam Switkowski ahead of Round 9 and didn't return to the AFL line up for the rest of the season.
Simpson played his first game of 2025 for the senior team in Round 9 having 18 disposals. This resulted in him retaining his spot for the following week's clash against the Greater Western Sydney Giants where he kicked his first AFL goal and continued his good form collecting 14 disposals.[5] Unfortunately, 8 minutes into the match next week Simpson suffered an AC joint injury. This caused Simpson to be sidelined for 2 months and turned out to be his final appearance in purple for the year.[6]
