Banfield made his debut for Brisbane in the first round of the 2010 season.
In round 6 Banfield received an AFL Rising Star nomination when he kicked a career best three goals.[3]
In the 2010 season Banfield was one of the few Lions to play every match. He finished the season as the third highest goal scorer (27) for the club, only behind Jonathan Brown (53) and Brendan Fevola (48).
At the end of the 2013 season Banfield was delisted from Brisbane without playing an AFL match for the entire year.[4] He was subsequently picked up by Richmond for pick 11 in the 2014 Rookie Draft.
Richmond announced that he was delisted on 9 September 2014, along with seven other players.[5]