FC Tokyo's newly signed right-back Sei Muroya has suffered a Jones fracture in his left foot with no timetable set for his return, the J. League first division club announced Monday.

The 21-year-old Muroya only joined Tokyo earlier this month from Meiji University, after playing an instrumental role in Japan's qualifying for the Rio de Janeiro Olympics through the Asian Under-23 Championship.

Muroya picked up the injury, which could now jeopardize his part in Rio in August, during training on Thursday. While Tokyo did not offer details of his recovery program, a Jones fracture — a form of stress fracture common among athletes often requiring surgery — typically requires two to three months to heal.

Unless treatment is carefully monitored, the chances of a relapse are also highly likely.