Rio Haryanto has just five rounds to secure his Formula 1 future after it was confirmed he has only paid for his Manor Racing drive up to July's Hungarian Grand Prix.

Having made history as the first person from Indonesia to start an F1 race, Haryanto is known to have received a substantial portion of his funding for the Manor drive through the Indonesian government via sponsorship from state oil company Pertamina.

However, his manager Piers Hunnisett has confirmed the deal is only valid until the 11th round of the season at the Hungaroring before more funding will need to be sourced.

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Despite this, Hunnisett says negotiations are well underway to extend this until the end of the season and is hoping to have something confirmed as early as the next event in Canada.

"The sponsorship is all paid for up until the 11th race," Piers Hunnisett told Reuters at the Monaco Grand Prix. "No problem there. That's fully paid. It's just the process in Indonesia with the government.

"I think in the next couple of weeks, and hopefully before Canada (the seventh race on June 12), we'll get something confirmed."

A race winner in GP2, Haryanto's graduation to F1 has acquired him a huge following in Indonesia - the fourth largest country in the world by population -, a fan base that Hunnisett believes will persuade Pertamina to continue supporting him.

"The news in Indonesia is huge, all the ministers support Rio, the media and the public. There's a possibility that Pertamina may come up with some additional funds.

"Formula One is all very new to Indonesia, it will be incredible if Rio didn't finish the season," he said. "I'm quite confident he will be there for the year. But in all governments, not just Indonesia, it's never easy or straightforward."