Vlastuin made his AFL debut in round 5 of the 2013 AFL season in an away game against Fremantle at Subiaco Oval. In round 7 of the same season he was nominated for the 2013 AFL Rising Star after a 23 possession game against Port Adelaide. He also kicked his first career goal in the match. He would go on to play 18 games in his first season, recording an average of 16.3 disposals and 4.8 marks per game and placing sixth in the Rising Star award. In addition he received the Cosgrove-Jenkins award as the club's best first-year player.
