The study explored the potential utility of a non-helmeted wearable accelerometer to augment concussion screening of elite AFL & AFLW players. 92 AFL and 118 AFLW players were recruited during the 2017 season. The X-Patch® accelerometer identified players with high head acceleration events (HAEs) defined as >95g (males) and >85.5g (females) which were compared to players identified for sideline assessment. High HAEs were verified using video footage. A subset of videos were reviewed for players demonstrating concussive signs by a trained medical reviewer blinded to accelerometer outputs. High HAEs were recorded for 26 players (50% male). Ten of these players were not visible on video at the time of the HAE (head impacts could not be confirmed). Of the remaining 16 players, two were identified by club personnel and had signs of concussion on video. Among the 14 players not identified, seven had head impacts that could be confirmed on video, and seven were visible in the footage however no head impact was identified. Among 184 players without high HAEs, five players were identified to have potential concussion. HAEs as measured by the X-Patch® are not sufficiently reliable to be used in practice for concussion screening.