On 15 October 2017, Duggan was named at left wing-forward but played at full-forward when Clooney-Quin qualified for their first Clare Senior Championship final in 73 years.
He made his first appearance on 27 April 2011 when he was introduced as a half-time substitute for Frank Melody in a 6-24 to 1-08 defeat of Kerry in the Munster Championship.
[4] On 19 July 2012, Duggan made his first appearance for the Clare under-21 team when he came on as a substitute for Tony Kelly in a 2-22 to 0-09 Munster Championship defeat of Waterford.
[8] On 14 September, Duggan won his second successive All-Ireland medal, in spite of being held scoreless, following Clare's 2-28 to 0-12 defeat of Antrim in the final.
[9] On 30 July 2014, Duggan won a third successive Munster Championship medal after scoring two points from right wing-forward in Clare's 1-28 to 1-13 defeat of Cork in the final.
[citation needed] On 10 February 2013, Duggan claimed his first silverware when Clare defeated Tipperary by 1-21 to 1-13 to win the Waterford Crystal Cup.
[19] Duggan was dropped for the replay on 8 May, however, he won a National League medal as a non-playing substitute following Clare's 1-23 to 2-19 defeat of Waterford.