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TORONTO/TOKYO -- Major sporting nations Australia and Canada quit the Tokyo 2020 Olympics on Monday as organizers faced global pressure to postpone the Games due to the coronavirus crisis for the first time in their 124-year modern history.

Putting back the July 24-Aug. 9 event, as is looking inevitable, would be a massive blow for host Japan which has pumped in more than $12 billion of investment.

Huge sums are also at stake for sponsors and broadcasters.

But a groundswell of concern from athletes -- already struggling to train as gyms, stadiums and swimming pools close around the world -- appears to be tipping the balance, along with the cancellation of other major sports events.

The International Olympic Committee and Japanese government have both edged back from weeks of blanket insistence the Games would go ahead, announcing a month-long consultation over other scenarios including postponement.

The Olympics have never before been delayed, though they were cancelled altogether in 1916, 1940 and 1944 during the World Wars and major Cold War boycotts disrupted the Moscow and Los Angeles Games in 1980 and 1984 respectively.

"The moment the IOC indicates that it is thinking about other solutions, it has already decided to delay the Games," said French Olympic Committee president Denis Masseglia.

Canada and Australia both bluntly said they would not participate if the Games were not put back to 2021.

"We are in the midst of a global health crisis that is far more significant than sport," said Canada's Olympic Committee and Paralympic Committee in a statement.

"Our athletes have been magnificent in their positive attitude to training and preparing, but the stress and uncertainty have been extremely challenging for them," said Australia's Olympics Chef de Mission Ian Chesterman.

Paralympic athletes were considered at particular risk from the epidemic given some had underlying health problems. More than 14,600 people have died globally from the coronavirus.

Russia urged global sporting authorities to avoid "panic" over the Olympics and U.S. President Donald Trump expressed confidence in Japan's government to make the "proper" call.

But a raft of other nations pressed for a quick decision from the IOC, which is led by its powerful president, Thomas Bach, a German lawyer and former Olympic fencing champion.

Athletes were broadly supportive of postponement, though sad.

"Competing in the Olympics is my #1 goal but I fully support this decision and I commend our leadership for taking a stand," tweeted Canadian tennis player Gabriela Dabrowski.

Only a few dissented, reigning Pan American 400 metres hurdles champion Sage Watson calling Canada's move "premature."

Monday's announcements followed growing pressure from big stakeholders including U.S. Track and Field, UK Athletics and other national Olympic committees.

"An Olympic Games in July this year is neither feasible nor desirable," World Athletics chief Sebastian Coe said. "We owe it to our athletes to give them respite where we can."