His West Germany career lasted for just eight years due to his decision to retire from the West German team following EURO'88. Immel had been the starting goalkeeper since Harald Schumacher's ban from the team in 1987, and his 19th appearance in the semi-final of the 1988 UEFA European Football Championship at Volksparkstadion, Hamburg, remained his final cap for his country and made him miss out on the title winning 1990 FIFA World Cup squad for which Bodo Illgner then served as starting goalkeeper. The mentioned 1988 UEFA European Football Championship was Immel's fifth participation in a big international tournament. He later admitted his decision to retire from the international game at barely 28 just because of the competition from Bodo Illgner for the goalkeeper's jersey, was extremely hasty. He was however part of the squad that won the 1980 UEFA European Championships.