Chair began his career in the youth system at Lierse.[5] He also spent time at the academy of Club Brugge, as well as the JMG Academy Belgium.[6] Chair made his professional debut for Lierse at the age of 17, playing in the Belgian Second Division, when he came as a 76th-minute substitute in Lierse's 1–1 away draw at Coxyde on 9 August 2015.[7][8] He subsequently started his first match a month later, on 9 September 2015, playing the full 90 minutes in a 3–2 home defeat to Cercle Brugge.[7][9]