Kammala jumla mai zuwa: Domínguez ya lashe lambar azurfa tare da Spain a 2018 FIBA U16 European Championship a Serbia, yana da maki 8.9. A Gasar Zakarun Turai ta FIBA U16 ta 2019 a Italiya, an nada shi mafi kyawun ɗan wasa bayan ya sami maki 13.4, 3.4 ya sake dawowa da kuma taimakawa 2.3 a kowane wasa kuma ya jagoranci Spain zuwa lambar zinare. Domínguez ya jagoranci tawagarsa zuwa matsayi na biyar a
2021 FIBA Under-19 gasar cin kofin duniya a Latvia, yana da maki 18.7, 2.9 rebounds da kuma taimakawa 2.4 a kowane wasa.