Football team Nagoya Grampus announced that forward Mu Kanazaki tested positive for the virus, less than a week after the J.League announced plans to restart the campaign on July 4, albeit without fans in stadiums, and as many clubs returned to full training.
Later on Wednesday, the Tokyo-based Nippon Professional Baseball (NPB) team Yomuiri Giants announced that two players, shortstop Hayato Sakamoto and catcher Takumi Oshiro, had also tested positive.
The Giants' scheduled pre-season game against the Seibu Lions on Wednesday was cancelled.
