Pari gbolohun ti o tẹle: Domínguez gba ami ayo fadaka pẹlu Spain ni 2018 FIBA U16 European Championship ni Serbia, ni apapọ awọn aaye 8.9. Ni 2019 FIBA U16 European Championship ni Ilu Italia, o jẹ oṣere ti o niyelori julọ lẹhin ti o ṣe apapọ 13.4 awọn aaye, 3.4 rebounds ati 2.3 ṣe iranlọwọ fun ere kan ati yori si Ilu Sipeeni si ami wura. Domínguez kó ẹgbẹ́ rẹ̀ lọ sí ipò karùn-ún ní
2021 FIBA Under-19 World Cup ni Latvia, ní ìpíndọ́gba 18.7 points, 2.9 rebounds àti 2.4 assists fún ìdíje kan.