In September 1974, Imai was selected the Japan national team for 1974 Asian Games. At this competition, on September 3, he debuted against Philippines. In March 1977, he played for Japan for the first time in 3 years at 1978 World Cup qualification. In 1978, he was also selected Japan for 1978 Asian Games. In 1980, he played at 1980 Summer Olympics qualification. This qualification was his last game for Japan. He played 29 games for Japan until 1980.