Tokyo's grand opening on Friday will have none of that splendour or grandiosity.

Instead it will be a scaled down affair, a "sobering" performance, Marco Balich, longtime opening ceremonies executive producer, and now a senior advisor to the Tokyo ceremonies executive producer, told Reuters in an interview.

"It will be a much more sobering ceremony. Nevertheless with beautiful Japanese aesthetics. Very Japanese but also in sync with the sentiment of today, the reality," Balich, who was in charge of the 2016 Rio de Janeiro Olympics, said.

"We have to do our best to complete this unique and hopefully the only one of its kind Olympics."

Rising COVID-19 cases in Tokyo have cast a large shadow over an event that, having already been postponed last year because of the pandemic, will now take place without spectators.

Japan this month decided that participants would compete in empty venues to minimise health risks.

So far there have been 75 cases of COVID-19 infections in Japan among those accredited for the Games since July 1, when many athletes and officials started arriving.

This has also affected the opening ceremony, with not all athletes present at the teams' parade as many fly in just before their competitions and leave shortly after to avoid contacts as much as possible.

Instead of more than 10,000 athletes marching into a capacity-crowd stadium as usual, the team parade will be smaller, in a largely empty Tokyo Olympic stadium bar a few hundred officials, and with tight social distancing rules.

"There will be several hundred marshals to guide the athletes for the parade. The opening ceremony in a way is going to be unique and focus only on the athletes," Balich said.

"That (pandemic) of course has consequences. Mass choreography is not happening obviously, because of COVID-19."

There is widespread concern among the public over the safety of holding the global sporting spectacle amid the pandemic and many Japanese fear the Olympics could turn into a super-spreader event.

"It will be very meaningful, far from the grandiosity of previous ceremonies. The moment is now. It is a beautiful effort. A very truthful, honest ceremony, nothing fake," Balich said.

"Not smoke and mirrors. It will be about real stuff happening in today."

Australian Associated Press