Eighteen-year-old Affleck is an attacking wing-back who has been ever-present in FC United’s youth team this season, and scored a 35-yard screamer in a 6-0 away win at Burscough in the FA Youth Cup.
Affleck joined FC United at the start of the 2016/17 season playing for FC United`s youth team alongside Mike Jones and Sam Baird, who are now both first-team regulars.
Affleck was selected as one of the substitutes away at Marine AFC last Saturday.
FC United CEO Damian Chadwick told the club`s official website: “We are pleased to add yet another talented young player into the first team squad, further demonstrating a clear pathway from the youth team to first-team”.