|Full name||Derek Henry Junior Duncan|
|Date of birth||23 April 1987|
|Place of birth||Upton Park, England|
|Height||5 ft 9 in (1.75 m)|
|2006||→ Lewes (loan)||5||(0)|
|2007–2008||→ Lewes (loan)||5||(0)|
|* Senior club appearances and goals counted for the domestic league only and correct as of 17:39, 2 January 2017 (UTC).
Duncan was signed by Grays Athletic on a one-year contract on 25 May 2007, following his release by Leyton Orient. The left-winger left Grays Athletic by mutual consent, just a month after he signed, after his agent offered him to other Football League clubs.
Duncan was signed by Paul Lambert in the summer of 2007 and joined Wycombe Wanderers, where he failed to make a league appearance before having his contract terminated by mutual consent in January 2009.
On the same day it was announced that he had left Wycombe Wanderers, it was announced that the winger had signed for Ebbsfleet United until the end of the 2008–09 season. The following day Duncan made his debut for Ebbsfleet in their 1–0 home league win over Rushden & Diamonds.
Isthmian League side VCD Athletic recruited Duncan for the 2016-17 season. He featured throughout the first part of the season, before picking up a straight-red card sending off on January 1, 2017 versus local rivals Phoenix Sports.
- Hugman, Barry J., ed. (2009). The PFA Footballers' Who's Who 2009–10. Mainstream Publishing. ISBN 978-1-84596-474-0.
- "Grays sign ex-Orient midfielder". BBC Sport. 25 May 2007. Retrieved 25 May 2007.
- "Duncan Released from Grays". Grays Athletic F.C. 26 May 2007.
- "Derek Duncan signs for Wycombe". Wycombe Wanderers F.C. 26 May 2007.
- "Duncan Departs". Wycombe Wanderers F.C. 16 January 2009.
- "Chairboys choose Fleet chance". Ebbsfleet United FC. 16 January 2009.
- "Ebbsfleet United boss Liam Daish re-signs quartet". BBC News. 10 July 2010.
- "Derek Duncan Signs". Woking F.C. 29 July 2011.
- "Derek Duncan Sending off". VCD Athletic. 2 January 2017.