Born in Athis-Mons, Essonne, Duplan began his career at Choisy-le-Roi before gaining recognition at Clermont Foot. During his early amateur years, he studied philosophy at Lycée Marcel Pagnol Athis-Mons.[4][5] In 2006, he moved to Dutch club RBC Roosendaal,[6] where he quickly became a fan favourite, leading to a transfer to Sparta Rotterdam in 2007. Unfortunately, a serious injury in his debut match cut short his first season.[7]
In the summer of 2010, Duplan joined Utrecht. Following the 2011–12 season, he won the David di Tommaso Trophy, awarded by Utrecht's supporters who voted him the club's best player of the season.[8]
Duplan retired from football in 2020 while playing for amateur club Westlandia. After retiring, he began studying to become a furniture maker.[9]
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