[2] Farnworth was a talented association football player as a youth and was part of the Manchester United development system before turning to rugby league.

The following year in 2018, Farnworth was loaned to Norths Devils (an affiliated club of Brisbane[5]) who play in the Queensland Cup.

[7] Farnworth played nineteen games and scored six tries for Brisbane in the 2020 NRL season as the club finished last on the table and claimed their first wooden spoon.

[citation needed] In Round 23 of the 2021 NRL season, Farnworth kicked four goals from four attempts, leading the Broncos to a 24-22 win over the New Zealand Warriors, ending their finals hopes.

[9] In round 14, Farnworth scored two tries for Brisbane in a 24-18 victory over Canberra but was taken from the field in the second half with a suspected bicep injury.

[15] In round 23 of the 2024 NRL season, Farnworth scored two tries in a Man of the Match performance for the Dolphins in their 34-32 golden point extra-time victory against the New Zealand Warriors.