Born in Dublin, McDermott was signed as a trainee by Manchester United in July 1998, before signing his first professional contract with the club on his 17th birthday. In his first season, he played 18 times for the under-17s team and three times for the under-19s, scoring four goals.
Born in Dublin, McDermott was signed as a trainee by Manchester United in July 1998, before signing his first professional contract with the club on his 17th birthday. In his first season, he played 18 times for the under-17s team and three times for the under-19s, scoring four goals.