The Leafield-based Super Aguri F1 team has signed Japanese driver Sakon Yamamoto as its test driver and reserve race driver for the British, Canadian and US Grands Prix.

Yamamoto has raced in Super GT and All Japan Formula Nippon Championship in Japan and has been released by Nissan and Kondo Racing to sign for Super Aguri.

Yamamoto said: "I am very happy to be coming into Formula One with Super Aguri F1 Team and I would like to thank everyone who has supported me. I will try to do my best in my new role as SAF1 Team third driver and give the team good feedback from my time in the car."