Cheerleaders from the "All Japan Cheer Organization" perform in protective masks due to COVID-19, to cheer people up in front of Shimbashi Station, one day before the start of the Tokyo 2020 Olympics in Tokyo, Japan July 22, 2021. REUTERS/Androniki Christodoulou

A member of staff wearing a protective face mask is seen in the stand during a soccer match at International Stadium Yokohama, Yokohama, Japan, July 22, 2021. REUTERS/Phil Noble

A young fan wears a face mask inside the stadium before women's soccer match between China and Brazil at Miyagi Stadium, Miyagi, Japan, July 21, 2021. REUTERS/Molly Darlington

David Rumbutis of Sweden, wearing a protective face mask, looks at his phone before training at the Ariake Gymnastics Centre, Tokyo, Japan, July 21, 2021. REUTERS/Mike Blake

The Olympic Rings are seen in front of the skyline during sunset in Tokyo, Japan, July 22, 2021. REUTERS/Kai Pfaffenbach

Cables for photographers and broadcasters are seen at a pitch side photo position at Tokyo Stadium, Tokyo, Japan July 21, 2021. REUTERS/Edgar Su

A security officer stands guard near the Athletes' Village in Tokyo, Japan, July 19, 2021. REUTERS/Naoki Ogura

Japan's aerobatics team, the Blue Impulse, skywrite Olympic rings in a practice run ahead of the official opening of the Games, July 21, 2021. REUTERS/Kai Pfaffenbach

Workers stand socially distanced beside Olympic mascots at a corporate stand in the Media Press Centre in Tokyo, Japan July 21, 2021. REUTERS/Clodagh Kilcoyne

Athletes and people wearing protective face masks arrive at Narita International Airport from Doha, after a Qatar Airways flight, July 21, 2021. REUTERS/Amr Abdallah Dalsh

Staff spray disinfectant after the women's soccer match between Britain and Chile at Sapporo Dome, Sapporo, Japan, July 21, 2021. REUTERS/Kim Hong-Ji

A member of staff wearing a protective face mask cleans Ariake Gymnastics Centre in Tokyo, Japan, July 21, 2021. REUTERS/Mike Blake