Born in Kinshasa but raised in Manchester, Faustin is a young winger who made his Manchester United-U18 debut off the bench in the 2013/14 season as an Under-15 schoolboy aged just 14. He is a former regional sprinting champion and has had a series of growth related injuries. His first start at Under-18 level came in the final game of the 2014/15 season.
Faustin had to wait until late in November 2015 for his first appearance of the 2015/16 season due to a long-term injury. He then spent some time on a youth loan at Bury to get some regular minutes.
Faustin made his Under-23 debut in April 2017 away to Leicester City.
Faustin was released by Manchester United at the end of the 2016/17 season.