Flanagan Jr. played alongside his father at the Bradford Bulls, making his first-team debut in July 2022 in a match against the London Broncos.
[3] Flanagan started his career coming through the ranks at the Bradford Bulls through their academy system.
He scored 14 tries for the Bradford Bulls in the 2019 season, helping them earn promotion through the playoffs back to the Championship.
Flanagan has received a £250 fine and an eight-game ban for an "attack to the testicles" against Hakim Miloudi during a Championship game on 4 August 2019.
[4] He has received another £250 fine and a ten-game ban for the same attack made during a Challenge Cup game on 21 March 2021.