[3] At age 16 he began also playing rugby league with the Caboolture Snakes before moving to the Redcliffe Dolphins where he won a 2014 junior premiership.

Horsburgh played from the bench in the club's 2019 NRL Grand Final defeat against the Sydney Roosters at Stadium Australia.

In round 7 of the 2020 NRL season, Horsburgh was taken from the field after twisting his knee in a tackle made by Parramatta Eels player Ryan Matterson.

An emotional Horsburgh walked to the sideline in tears and raised his middle fingers to the empty stand at Western Sydney Stadium.

[8] On 29 June 2020, Horsburgh missed the rest of the season with a Lisfranc foot injury sustained during Canberra's loss to Parramatta.

On 10 August 2021, Horsburgh signed a two-week loan deal to join bottom placed Canterbury-Bankstown to help their injury and suspension crisis.