Olympics organisers are “unwavering” on holding the coronavirus-delayed Games this year but can't rule out staging it without spectators, Tokyo 2020 CEO Toshiro Muto told AFP.

In an interview ahead of the Games' six-month countdown, Muto conceded people are “anxious” as virus cases soar worldwide, including in Japan where Tokyo is under a state of emergency.

But he insisted the Olympics were still possible, even without requiring athletes and fans to be vaccinated, and that public opinion will swing behind the Games once the virus situation improves.

“We are not discussing cancellation,” he said. “Holding the Games is our unwavering policy, and at this point in time we're not discussing anything other than that.”

Polling in Japan this month showed around 80 per cent of respondents oppose holding the Games this year, even after organisers unveiled a raft of anti-virus measures.