3 – 0 ▁away ▁win ▁over ▁Wat ford ▁on ▁the ▁opening ▁day ▁of ▁the ▁ 2 0 1 9 – 2 0 ▁season . ▁He ▁made ▁his ▁first ▁E FL ▁Cup ▁appearance ▁for ▁the ▁Sus sex ▁Club ▁where ▁he ▁capt ained ▁the ▁side ▁on ▁ 2 5 ▁September ▁ 2 0 1 9 ▁in ▁a ▁ 3 – 1 ▁home ▁loss ▁to ▁A ston ▁Villa ▁where ▁he ▁went ▁off ▁injured ▁in ▁the ▁game ▁where ▁Pot ter ▁gave ▁ 1 0 ▁deb uts ▁with ▁an ▁average ▁team ▁age ▁of ▁just ▁over ▁ 2 1 . ▁ ▁International ▁career ▁ ▁Northern ▁Ireland ▁D uff y ▁was ▁part ▁of ▁the ▁Northern ▁Ireland ▁youth ▁set - up ▁from ▁the ▁U 1 6 ▁level ▁up ward . ▁An ▁U 1 7 ▁regular , ▁he ▁was ▁in ▁the ▁squad ▁for ▁their ▁un success ful ▁ 2 0 0 9 ▁European ▁Championship ▁qual ifying ▁campaign ▁and ▁scored ▁the ▁only ▁goal ▁of ▁the ▁match , ▁a ▁penalty , ▁in ▁the ▁opening ▁game ▁against ▁Lie chten stein . ▁ ▁A ged ▁ 1 7 , ▁he ▁was ▁called ▁up ▁to ▁the ▁senior ▁team ▁in ▁June ▁ 2 0 0 9 ▁for ▁a ▁friendly ▁against ▁Italy ▁but ▁was ▁an ▁un used ▁substitute . ▁In ▁August ▁ 2 0 0 9 , ▁he ▁made ▁his ▁Northern ▁Ireland ▁U 2 1 ▁debut , ▁playing ▁the ▁whole ▁match ▁and ▁scoring ▁in ▁the ▁ 2 – 1 ▁away ▁loss ▁to ▁Portugal . ▁ ▁D uff y ▁played ▁several ▁games ▁in ▁the ▁ 2 0 1 0 ▁UEFA