Reilly made his debut just one year out of the rugby nursery of St Joseph's College, Hunters Hill. The 19 year old man impressed coach Tim Walsh in his second world series cap in London,[2] scoring 3 tries in just 2 games, before getting injured before his remaining games. In 2017, Reilly played for the Australian Youth Rugby Sevens team who finished third in the World youth all schools tournament which was played in New Zealand,[3] where he scored 5 tries.
In 2022, Reilly joined Western Suburbs in the NSW Cup. In round 25 of the 2023 NRL season, Reilly made his first grade debut for the Wests Tigers against the Dolphins. Reilly played two further games for the club as they finished the year with the Wooden Spoon. On 21 November, it was announced by the Wests Tigers that they had released Reilly after he was not offered a new contract.[5]