Valtteri Bottas says he is surprised to find Williams so far adrift of Ferrari following the Malaysian Grand Prix, saying the team 'has work to do'.

Though he was able to fight back from a poor start that left him as low as 14th at one stage to finish the Sepang race in fifth, Bottas ended the race more than a minute behind Sebastian Vettel in the race winning Ferrari, while Kimi Raikkonen was 17secs up the road despite getting a puncture on the opening lap.

It is a result that alarms Bottas, the Finn saying the margin to what was anticipated to be its closest rival pre-season is bigger than he anticipated.

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"In an ideal race, starting at the front, it wouldn't be that big, but it is still much bigger than we expected. It shows that we have a lot of work to do and there is much more potential, we need to get more power from us. We will have some updates coming and all we can now learn from anything we can, to just keep pushing to the maximum.

"This is extreme conditions and Ferrari seem better than anyone with the tyre degradation, so we will see in China, but I think they are in front of us. We need to keep working hard if we want to challenge them."

Placing emphasis on a lack of speed out of slower corners, particularly when compared with the Renault-powered Toro Rossos he spent much of the race competing against, Bottas says there is work to do.

"In traffic, we seem to struggle a bit in the slow speed corners, getting out of them, compared to the Toro Rossos and Red Bulls we are missing a bit, but in the high speed corners we seem to be OK. Straight-line speed is good, but we are missing in those places.

"They seem much stronger where we are weak, like the slow speed corners, but then we have an advantage in the straight lines and high speed corners."