Horsley had a powerful return to the WAFL finishing third in the Sandover Medal count after leading the Lions to their 12th premiership.

[1] Horsley made his state debut for Western Australia in 2008 against Queensland in Townsville, and also played in the interstate game in 2010.

[8] He made his debut the following week against North Melbourne at Docklands Stadium, replacing the injured Gary Ablett,[9] and recorded 19 disposals and eight tackles.

Horsley recovered from his anterior cruciate ligament injury for Round Four against Peel; kicking the first goal in a 17-point win over the Thunder.

He amassed 499 disposals from 19 games on the season as well as leading Subiaco to their 12th WAFL premiership over the East Perth Royals.