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An unidentified overseas visitor has tested positive for Covid-19 at the Tokyo Olympics athletes' village, organizers said on Saturday -- the first such case amid concerns the Games could become a super-spreader event, CNN reports.

Speaking at a news conference, Tokyo 2020 CEO Toshiro Muto confirmed a non-resident of Japan who is involved in organizing the Games had tested positive, adding that the individual has been taken into quarantine outside of the village. He would not reveal the person's nationality, citing privacy concerns.

There have now been a total of 45 Covid-19 cases linked to the Games, with athletes, officials and contractors testing positive for the virus. Athletes are just starting to arrive for the Games, which run July 23 through August 8.

Organizers already decided in March to ban overseas fans from the stands, but this month the Japanese Olympic Committee said Tokyo venues will not have spectators due to the city's coronavirus state of emergency -- an unprecedented move, according to an International Olympic Committee (IOC) spokesman.

More than 11,000 athletes from 205 national Olympic committees are scheduled to compete in the Games. Around 85% will have been vaccinated against Covid-19, according to the IOC.