Rubuta ci gaba don wannan sakin layi - Bayan da ya riga ya buga wa Ingila U16 a 2011, Ya fara bugawa Jamhuriyar Ireland U19 a watan Satumbar 2014, a cikin nasara 1<unk>0 a kan Netherlands U19. A ranar 4 ga Satumba, 2015, ya fara bugawa Jamhuriyar Ireland U21 wasa a nasarar 4 zuwa 1 a kan Qatar U23 a wasan sada zumunci a Gigg Lane. A ranar 25 ga Maris, 2017, Cullen ya jagoranci Jamhuriyar Ireland U21s zuwa nasara 1<unk>0 nasara a kan Kosovo U21 a cikin UEFA Under-21 Championship Qualifier
Ka yi haƙuri.