A left-winger, Duncan joined Hull City from Aberdeen Richmond in 1928 and spent his entire professional career in England. He joined Derby County for £2,000 in 1932 and remained contracted to the club until 1946. During this period he earned 14 caps for the Scottish national team, scoring 7 goals between 1932 and 1937. He was also received an FA Cup winners medal with Derby in 1946.
After "guesting" for Reading, Notts County and Nottingham Forest during World War II, Duncan moved to Luton Town as a player-coach in October 1946. He was appointed manager in June 1947 and retained the position until October 1958. He then managed Blackburn Rovers for two seasons, helping them to the FA Cup final in 1960. The Blackburn performance included a man of the match performance by Ally MacLeod.
- Scores and results list Scotland's goal tally first.
|1||26 October 1932||Tynecastle Park, Edinburgh||Wales||2–5||2–5||BHC|
|2||4 October 1933||Ninian Park, Cardiff||Wales||2–3||2–3||BHC|
|3||21 November 1934||Pittodrie Park, Aberdeen||Wales||1–0||3–2||BHC|
|4||6 April 1935||Hampden Park, Glasgow||England||1–0||2–0||BHC|
|5||6 April 1935||Hampden Park, Glasgow||England||2–0||2–0||BHC|
|6||5 October 1935||Ninian Park, Cardiff||Wales||1–0||1–1||BHC|
|7||13 November 1935||Tynecastle Park, Edinburgh||Ireland||2–1||2–1||BHC|
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