A powerful midfielder who's excellent on the ball, good at building play and always ready to break up opponents' attacks. Naturally left-footed, he came to Inter in March 2011. He claims to have learnt a great deal watching Thiago Motta in training and in games. He lives at the Centro Sportivo Giacinto Facchetti in Milan.

After settling into the Nerazzurri's youth academy, Duncan first caught the eye as one of the stars of the Primavera in the 2010/11 season with Fulvio Pea, and he has continued that into this season first under Andrea Stramaccioni and then under Daniele Bernazzani.

He was one of the stand-out players in the Inter side which won the NextGen Series and scored one of the penalties in the shoot-out against Ajax. In total he has scored 6 times with the Primavera, 5 in the league and once in the Coppa Italia.

Duncan was trained with Internazionale since summer 2010. However due to FIFA regulation, he formally joined Inter in March 2011, after his 18th birthday. He lives in Inter training centre "Centro Sportivo Giacinto Facchetti" in Milan.  Duncan made his Serie A debut for Inter on August 26, 2012 in a match against Pescara when he came on as a substitute in the 86th minute for teammate Walter Gargano.