A basketballer who came to football late, Zakostelsky was best afield in the WAFL Colts Grand Final for Claremont and finished top 10 in four of five tests at the draft combine before Brisbane took him at pick 51 in 2023. The 196cm ruck-defender debuted in Opening Round against the Western Bulldogs and kicked a goal. He has played 3 games and kicked 1 goal.