Green has represented the United States in multiple FIBA junior tournaments, but he has also shown interest in playing for the Philippine national team in the future due to his Filipino background.
Green made his national team debut for the United States at the 2017 FIBA Under-16 Americas Championship in Formosa, Argentina. In five games, he averaged 9.8 points, two rebounds, and one steal per game, helping his team win the gold medal. He was named most valuable player (MVP) of the 2018 FIBA Under-17 Basketball World Cup in Argentina after averaging a team-high 15.7 points, 2.3 rebounds, and 1.7 assists per game and winning the gold medal. Green won another gold medal with the United States at the 2019 FIBA Under-19 Basketball World Cup in Heraklion, Greece. As the youngest member of his team, he averaged 10.1 points, 2.1 rebounds, and 1.7 steals per game.
