Olympic President Juan Antonio Samaranch defended the growing acceptance of professionals being allowed to compete at the Games. Speaking at the opening ceremony of the 90th session of the International Olympic Committee in Berlin, he said IOC rules have had to be adapted to the times.

Samaranch said a big problem is the different approach taken by the state-aided Eastern Bloc than by the Western nations.

Samaranch said the future is bright, despite political boycotts at the last two Summer Olympics. He offered as proof the number of bidders for the 1992 Summer and Winter Olympics.

Making presentations yesterday for the Summer Games were Amsterdam, Barcelona, Belgrade, New Delhi, Paris and Brisbane, Australia; for the Winter Games, Albertville, France; Berchtesgaden, West Germany; Cortina D'Ampezzo, Italy; Falun, Sweden; Lillehammer, Norway, and Sofia, Bulgaria.

The United States and Great Britain have until Aug. 15 to enter the bidding . . .

South Korean Sports Minister Lee Yong-Ho said in Berlin he has received assurances there will be no Soviet Bloc boycott of the 1988 Summer Games at Seoul . . . International Soccer Federation (FIFA) President Joa o Havelange told the IOC the European Soccer Union's indefinite ban on English club teams does not exclude the country's national team from international matches.