
Yamamoto suffered a major impact with the barriers in the sixth round of the SUPER GT season at Sugo after the Team Kunimitsu driver collided with the Kondo Racing Nissan GT300 car of Teppei Natori.
The two-time GT500 champion was airlifted to hospital in the nearby city of Sendai, and while he was released the same day he was transferred to a different medical facility for further examination.