In February 2011, Muscat announced his intention to retire from club football after the conclusion of the 2011 Asian Champions League. His decision to finish was fast-tracked by an infamous tackle he committed in a Melbourne derby on 22 January 2011, which resulted in a season-ending eight-week ban from the A-League. Muscat played out his competitive career in the 2011 AFC Champions League under the captaincy of centre-back Adrian Leijer, despite having previously referred to the competition as "not all that enjoyable". Muscat regained the captaincy for his farewell match in Melbourne, a 1–1 draw against J-League side Gamba Osaka. Muscat scored on his return to Sunshine George Cross in a 3–1 loss to Altona Magic in August 2011.