|High School:||FC Bolts Celtic|
BEFORE UNH: Played at FC Bolts Celtic Academy for the previous four years. There, he was elected team captain for three of the four years he played. As a student at Buckingham Browne and Nichols in Cambridge, Mass., Thomson was a member of the varsity squad for two years before committing to the Bolts. As a junior at BB&N, he was selected to the Independent School League All-League team and as an ISL All-Star. In the summer of 2012, Thomson had a two-week trial with Nottingham Forest in England. Originally committed to Michigan, Duff chose to play for the Wildcats.