Olympic athletes will be subject to GPS monitoring as will members of the media.
Tokyo 2020 Organising Committee CEO Toshiro Muto said this on Wednesday.
Muto, speaking at a news conference, also said the monitoring system will be used not to track every single movement of the Olympic participants but to retroactively trace them if an issue arises.
The Japanese capital is set to host the once-postponed Tokyo 2020 Olympics from July 23, amid concerns that the global event will burden a medical system already strained by the coronavirus pandemic.
Many Japanese and medical experts oppose staging the Games saying they could trigger a new wave of infections.
Some 80 percent of athletes qualified for the Olympics have already been vaccinated against COVID-19, but the International Olympic Committee is pushing to raise that number with just over a month to go before the start of the Games.
New Zealand overcame a blitz from centurion Harry Brook to beat England by four wickets on Sunday in the opening game of their three-match one-day international series, with Daryl Mitchell and Michael Bracewell scoring half-centuries.
Belinda Bencic breezed past Czech sixth seed Linda Noskova 6-2 6-3 to win the Pan Pacific Open title on Sunday, erasing bitter memories of her straight-sets defeat by Agnieszka Radwanska in the title clash of the same tournament 10 years ago.
Liverpool manager Arne Slot said opponents have identified a winning strategy against his Premier League champions and he needs to find a solution fast after a 3-2 defeat at Brentford on Saturday made it four league losses in a row.
Rohit Sharma hit a century and Virat Kohli a bright 74 to drive India to a nine-wicket win in the third one-day international on Saturday, sending fans home happy after what are likely to be their final appearances in Australia in their country's colours.