Japanese Prime Minister Shinzo Abe has said it will be difficult to host the Olympics next year unless the pandemic is contained.
The Olympics were originally set to be held this year but were postponed until July 2021.
There has been doubt as to whether the games will go ahead.
"We've been saying that the Olympic and Paralympic Games must be held in a complete form, in that athletes and spectators can all participate safely," Abe said.
"It would be impossible to hold the games in such a complete form unless the pandemic is contained."
He added that the Olympics "must be held in a way that shows the world has won its battle against the coronavirus pandemic. Otherwise it will be hard to hold the games."
On Tuesday Games chief Yoshiro Mori said the Olympics would be "scrapped" if they could not take place in 2021.
Japan has confirmed 13,895 infections and more than 413 deaths.