As reserve goalkeeper to Perth Glory FC number one Danny Vukovic, Jack Duncan saw little game time in the first half of the 2013/14 Hyundai A-League season until Vukovic secured a short loan move to Japanese J-League side Vegalta Sendai. From there, Duncan won many plaudits in six solid performances for Perth Glory FC, where the 21-year-old showed great maturity between the posts.
Outside of Perth Glory FC, Duncan has represented Australia at both U20 and U23 level and previously appeared once off the bench for former club Newcastle Jets.