The update has brought the total number of those infected since July 1 to 81, with the cases detected among athletes residing in the Olympic village, members of foreign delegations and personnel.
Additionally, the novel coronavirus has been detected in four athletes and accompanying personnel from training camps located outside Tokyo, the organizers added.
Overall, more than 30 of these new infection cases are foreign nationals.
The Summer Olympics in Tokyo was originally set for 2020 but were postponed in the spring of last year due to the coronavirus pandemic. The Games are set to take place from July 23 to August 8 this year.