Yamamoto hopeful of more HRT outings

The Japanese driver filled in for Bruno Senna at the British Grand Prix, and has replaced Karun Chandhok for the races in Germany and Hungary.

And although Yamamoto has been outqualified by his team-mate in both races so far, he thinks there is a good chance he could keep his seat for the next race in Belgium.

"I heard now the team has four drivers and the team is going to decide race by race who is going to drive - from a performance side," said Yamamoto.

"So far I have a shown a good performance at Silverstone and Hockenheim, so now I have another chance to drive. So I am very happy and appreciate it for the team. I am pretty positive to keep my concentration on the job and 100 per cent do my best, and it will be my best."

When asked if he was optimistic about staying in the cockpit for Spa-Francorchamps, Yamamoto said: "I believe that if I can do a good race and a good result then I am very positive to be continuing."

Although Yamamoto has considerable sponsorship backing behind him, he is adamant that he has earned the race seat on merit rather than because of how much his finances are a help for the team.

"Actually it is not [about sponsorship]," he said. "It's my performance on the race track."