The 2020 Olympic and Paralympic Games in Tokyo is currently in doubt after Canada became the first major country to withdraw.
Their announcement came shortly after the Japanese Prime Minister, Shinzo Abe, admitted for the first time that the games could be postponed.
Meanwhile, the Australian team has said it was “clear” the games could not go ahead, and told its athletes to prepare for a 2021 games.
The games are due to begin on 24 July.
Canada’s Olympic and Paralympic committee said it had taken “the difficult decision” to withdraw after consulting athletes, sports groups, and the Canadian government.
It then “urgently called” on the International Olympic Committee, International Paralympic Committee, and World Health Organization, to postpone the games for a year.
“While we recognise the inherent complexities around a postponement, nothing is more important than the health and safety of our athletes and the world community,” their statement said.
The Canadian later posted a message on Twitter saying: “Postpone today. Conquer tomorrow.”