These countries were formally admitted in 1977, the same year when SEAP Federation changed their name to Southeast Asian Games Federation (SEAGF), and the games were known as the Southeast Asian Games.
Kedua negara ini masuk secara resmi pada 1977, dan pada tahun yang sama Federasi SEAP berganti nama menjadi Southeast Asian Games Federation (SEAGF), dan ajang ini menjadi SEA Games.