Volpato represents Italy at the youth level, and is provisionally cap locked(4 caps and 2 goals at the U19 Euro). He most recently has represented the U20s, and has 2 caps and 1 goal. Australian is his second nationality, he even snubbed a senior call-up.
Facundo Buonanotte does not possess Italian nationality, only Argentinian. Also, he is a natural attacking midfielder, a traditional 10, he can also play on the wings and centrally, but he mainly plays CAM.