Baily Cargill has been at the club since 2012 and continues to improve following loan spells at various Football League clubs.
The defender came through the ranks at the AFC Bournemouth youth academy and made his first appearance in August 2014 as a centre back in the 2-0 League Cup win at Exeter City.
Cargill has gained Football League experience as well over the past two years, as he went out on loan to Coventry City in the second half of the 2015/16 season and at Gillingham in the first half of the 2016/17 season, where he made 10 appearances, scoring one goal.
The 21-year-old then made his Premier League debut in March 2017 at Old Trafford in the 1-1 draw against Manchester United - becoming the first player from the club's academy to play in the top flight for the club.
This season, he is currently on loan with Fleetwood Town in League One.