Treacy is a key forward from Cohuna in Northern Victoria. He had a strong bottom-age year for the Bendigo Pioneers in the 2019 NAB League, ending the season as the no.1 ranked bottom-age key forward, finishing fourth in Bendigo's best and fairest and earning selection in the Vic Country state hub. Treacy is a fierce competitor. He relishes body contact and being physical in the contest, and he tackles with real aggression. He is also a strong contested mark, taking the third most of all bottom-agers in the NAB League in 2020. Treacy regularly hits the scoreboard, kicking the fifth most goals of bottom-agers in 2019, including a four-goal haul against Geelong in round 11. He also has good speed, recording a 2.97 seconds 20m sprint time at the Vic Country combine. The 18-year-old also has clear leadership attributes and was going to co-captain Bendigo in 2020 until Covid intervened, but being prevented from playing did not discourage him from continuing to work hard with characteristic intensity.