A government-backed watchdog has urged a Japanese construction company and an intermediate body to take measures to prevent abuses of foreign technical trainees after a Vietnamese man allegedly suffered serious injuries at the hands of Japanese co-workers at the company, Justice Minister Yoshihisa Furukawa said Tuesday.

The Organization for Technical Intern Training will further probe the case with the possibility that the watchdog may revoke the body's permit to act as an intermediary between such trainees and host companies, according to government officials.

The Vietnamese trainee was repeatedly assaulted by Japanese workers at the company in the city of Okayama for roughly two years and sustained serious injuries, including broken bones, according to a labor union representing the 41-year-old man.