Wuxuu u ciyaaray England U16 sanadkii 2011, wuxuuna u saftay Republic of Ireland U19 bishii Sebtember 2014, kulankii ay 1-0 kaga badiyeen Netherlands U19. Bishii Sebtember 4, 2015, wuxuu u saftay Republic of Ireland U21 guul 4-1 ah oo ay ka gaareen Qatar U23 kulan saaxiibtinimo oo ka dhacay Gigg Lane. 25-kii Maarso 2017, Cullen wuxuu kabtan u ahaa Xulka Qaranka Ireland ee U21s si uu ugu guuleysto 1-0 guusha Kosovo U21 ee UEFA Under-21 Championship Qualifier
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