Japanese gymnast Kohei Uchimura has tested positive for COVID-19 10 days before he was due to take part in an international meet seen as a major test of Tokyo's capacity to hold events ahead of next year's Olympics, organizers announced on Thursday.

Organizers said it was unclear whether Uchimura, who is a three-time Olympic gold medallist, will be pulling out of the Nov. 8 meet that will also feature athletes from China, Russia and the United States.