A total of 25 people were hospitalised due to Covid-19 during the Tokyo 2020 Olympic Games, instead of the initially reported five, organisers have said.

"The initial five we reported was the figure for overseas residents who were hospitalised," explained Tokyo 2020 CEO Toshiro Muto at a news conference.

"We released those figures to gauge how much of a burden people from overseas would put on the medical system."

The 25 cases now reported include Japanese residents and overseas visitors released from quarantine who were hospitalised, Reuters reports.