Rio Haryanto's future in F1 remains in doubt as negotiations into a contract extension that will take him to the end of the 2016 season near a deadline.

The Manor Racing rookie became the first driver from Indonesia to start an F1 race at the start of 2016 as part of a half-season deal that is understood to conclude with this weekend's Hungarian Grand Prix.

Though it is known Manor and Haryanto's management are working towards a deal that will see him stay until the end of the year, the man was unable to formally confirm whether he will be present at next week's German Grand Prix in Hockenheim.

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"I think so. We will see," he said. "Obviously if you see me at Hockenheim then I think that would secure the whole season."

Looking ahead to the Budapest race, Haryanto admits the race is likely to be 'slightly difficult' for the Manor team but is still setting his sights on getting the better of Renault and Sauber.

"It's a high downforce circuit it's going to be slightly difficult for us. But with a track temperature that will be quite high, this year there have been many occasions where we've struggled a lot to get the tyre to work and I think with the temperature now it can help us. We will see. I think if we can be in the mix with the Renault and Sauber will be the realistic goal."