Tokyo Governor Koike Yuriko has suggested that it would be difficult to further postpone the Summer Olympic and Paralympic Games.
Koike was asked by reporters on Friday if the Tokyo Games, which were postponed by one year due to the coronavirus pandemic, could be put off again.
The governor said another postponement would make the Games completely different, due to changes in athletes' motivation and physical abilities.
Koike stressed that the basic idea is to make sure the Games can be held in a safe and secure manner.
The Olympic Games are scheduled to open in late July.
A decision by the organizing committee and others on the spectator numbers will be made in June, while they monitor infection trends. Spectators from abroad have already been barred.
Koike said domestic sport events are now being held with attendance limits, and the rules they are asked to follow will serve as the basis for deciding what to do with the Tokyo Games.