Having started his career with Perth Glory in his hometown, Knowles is regarded as one of the most exciting talents in the A-League, where he climbed up through the system. Knowles is best known for his heroics in helping Oakleigh Cannons to their maiden National Premier League Championship in 2022, scoring 21 goals in two seasons with the club. He was named the join-best player of the tournament and managed to step up to the top flight with Brisbane Roar. The 27-year-old put on a show, scoring against the then-Premier League side Leeds United, on trials with the Roar and cemented his place in the team in the 2022-23 A-League campaign. He signed for Hyderabad FC and will ply his trade in the Indian Super League ahead of the 2023-24 season.