Abbassi played at the 2015 Afrobasket championship with the Tunisia national basketball team where he averaged 3 points and 1.2 rebounds per game. He participated in the 2016 FIBA World Olympic Qualifying Tournament in Turin, Italy. He also represented the Tunisia national basketball team at the 2019 FIBA Basketball World Cup in China where he averaged 1 point, 1 rebound and 1 assist per game.