Answer
The answer is two. Muscat led Melbourne Victory to their fourth A-League Championship in 2014–15, and guided them to their fifth in 2017–18. He became just the second coach to win multiple A-League Championships after Ange Postecoglou, who won three with Brisbane Roar. Muscat is also the third person, after Postecoglou and Tony Popovic, to have both played in and coached an A-League-winning team.