Sinclair was kept on by The Canaries during the 2003–04 season but failed to make a single appearance and was only named on the substitute's bench a handful of times. In the summer of 2004 Worthington released Sinclair after 16 months without any first team football.
Sinclair remained with The Canaries during the 2003–04 season but didn't get a chance to play and was only occasionally brought into the game as a substitute. In the summer of 2004 Worthington decided not to keep Sinclair on after 16 months without him playing any meaningful football.