Rio, Indonesia's first Formula One driver, has a contract with Manor for the full season but the funding his sponsors have committed only guaranteed his drive up to the just-completed Hungarian Grand Prix.

He's main sponsor is state-owned oil company Pertamina, which has contributed five million euros ($5.48 million) towards the funding needed to secure his seat at the sport's smallest team.

With the German Grand Prix scheduled for next weekend, there is little time to secure the additional funding, which Indonesian media has put at 15 million euros.

The British team's racing director Dave Ryan said following Sunday's race that keeping Rio was Plan A.

"We've got Rio on-board and we're working with Rio's management and we're doing everything we can to secure his drive for the rest of the year," said Ryan.

When asked if Manor had a Plan B should Rio Haryanto fail to secure the required funding Ryan said: "Yes, we've got a Plan B, we've got a Plan C, we've got a Plan D.

"Of course we have options and we have ideas. But plan A is to keep Rio in the car so that's the intention."

Rio said he was trying to focus on the next race in Germany.

"For my side I'm right now focusing only for Germany and the team is also focusing for Germany," he added.

REUTERS