Force India team principal Vijay Mallya believes his team is in for a close fight with Williams throughout the rest of the season.

While Williams impressed with a front row lock-out in Austria which translated in to third and fourth place in the race, Force India has been more consistent so far this season and currently sits fourth in the constructors' championship; one place ahead of Williams. Mallya told exclusively that he was concerned Force India would slip behind Williams in the standings last weekend but is expecting a battle for the rest of the year.

"From the pre-season test Williams has shown that it is very competitive this year, and they have the Mercedes power package this year as well," Mallya said. "They have been quick in qualifying but were not as brilliant in race pace. But in Austria they showed both and it was only a matter of time before it all came together for them.

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"So they are going to be a serious competitor. [On Saturday] I was quite worried with Williams starting with both cars on the front row that they might have scored more points than us and passed us in the constructors' championship. Fortunately we also scored points and minimised that so we still retain fourth, but they are close and it's going to be a close fight going forward."

With Force India based at Silverstone - venue of next weekend's British Grand Prix - Mallya said it would be an added bonus if the team could score another strong result at the next race.

"Silverstone has always been our home race. We have all the factory staff and everybody there, so it is very special for us. But we have got to take every race seriously and do our very best. Done are the days where we can say certain circuits suit us and certain circuits don't suit us; if we want to do well in the constructors' championship we need to perform well on all circuits.

"Of course, emotionally Silverstone is very important for us. So if we come away with a strong result the whole team is happy including those back at the factory who don't necessarily get to go to all the races. So Silverstone is important from that point of view."