Sydney coach John Longmire praised McCartin for his work rate during his first preseason .
He was the youngest player on an AFL list in round 1 , 2018 at 18 years and 82 days .
Sydney coach John Longmire praised player for player 's work rate during his first preseason .
He was the youngest player on an AFL list in round 1 , 2018 at 18 years and 82 days .