Duffy recorded six try assists and averaged 196.66 kicking metres per game in 2026 as he set his sights on Brisbane's halfback role for 2027.
Adam Reynolds held the position from 2022 until his retirement at the end of 2026. Brisbane won the 2025 premiership, its first in almost two decades.
After Reynolds' retirement decision, Brisbane signed Jonah Pezet to a three-year deal through 2029, following his agreement to a 12-month stopgap with the Parramatta Eels.
The club also released Coby Black from the final year of his contract so he could join the Canberra Raiders on a multi-year deal.
After Brisbane's bottom-four finish, Duffy told the Australian Associated Press that he and Pezet were competing for the number seven jersey.
"We are both going for that seven spot. It's a very friendly battle, but we both want it."
"Dozer (Hunt) is in there as well. He wants a seven as well."