It was announced on 12 April 2021 that Markovic will switch Victorian clubs to join Melbourne Victory's cross-town rivals Western United. In an interview with A-LeagueAccess, Markovic stated that his move to Western United was due to uncertainty with an expected club restructure. Furthermore, he stated that his move was "best for development". Two weeks later, he made his Western United debut in a 2–0 home win against Newcastle Jets.