Cika wannan jumla: Buckley ya kuma kasance tare da Ireland a matakin kasa da kasa. Ya kasance wani bangare na Irish da aka kafa a makarantar da kuma karkashin 18. Kodayake ya kasance wani ɓangare na 'yan wasan Ireland na ƙasa da 20 na Allen Clarke don duka Under-20 Six Nations da Junior World Cup a 2010, bai taɓa yin bayyanar da gefen ba. A babban matakin, an zabi Buckley don tawagar Ireland mai tasowa don shiga cikin
2015 Tbilisi Cup, kuma Clarke ya horar da shi. Ya buga wasanni biyu daga cikin wasanni uku na kungiyar yayin da suka lashe gasar a karon farko.