Duncan played for the AFC Leopards U20 team in 2013 after which he was promoted to the senior team with the recommendation by our former coach Luc Eymael. He made his debut for the senior team in a GOtv round of 16 match against Ligi Ndogo where he had two assists in the 2-0 win. He has scored one goal for the club in a match he played against Chemilil Sugar Fc. In 2016 Duncan left the club for Posta Rangers Fc where he played for a year after which he rejoined AFC Leopards in January 2017.Duncan is also a student at Nairobi University. He is the club’s 2nd assistant captain.