koufos was a member of the junior greek national under-18 team at the 2007 fiba europe under-18 championship in spain. he led his team to the tournament's final game, and although greece lost in the finals to serbia's under-18 team, koufos won the tournament's mvp award, after leading the competition in points, rebounds, and blocked shots, with averages of 26.5 points, 13.0 rebounds, and 3.5 blocks per game.