A coach in the African nation's delegation tested positive after arriving in Japan on Saturday (June 19), while a second member, an athlete, tested positive on Wednesday (June 23) after arriving in the team's host city of Izumisano.
Olympics Minister Tamayo Marukawa told a news conference that the person who arrived on Saturday had been found to have the highly-infectious Delta variant and that an analysis was also being conducted on the second confirmed case, NHK public TV reported.
The handling of the case has sparked criticism from local officials and experts and sparked fresh concerns about what lies ahead.
Japan's government and organizers have vowed to make the Games, which begin on July 23, "safe and secure."
But many Japanese remain sceptical about the possibility of holding even a scaled-down Games safely during the pandemic.