Felipe Massa and Valtteri Bottas will remain with Williams next season, the team has announced on the eve of the Italian Grand Prix.

The Williams team has enjoyed something of a renaissance this year, and while Massa results have been a bit mixed, and certainly less impressive than Bottas - who has taken four podiums and scored 110 points to date, compared to Massa's 40 - both will stay on in 2015.

"I'm delighted to confirm that Felipe and Valtteri will be racing for Williams once again in 2015," said Sir Frank Williams, founder and team principal, who believes the combination represents one of the strongest driver pairings on the grid.

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"Felipe is a pleasure to work with and combines raw pace with a wealth of experience. We have known for many years that Valtteri is a very special talent and in the FW36 we have given him a car that is allowing him to demonstrate his skills.

"The team is having a much improved 2014 season and the skill of our drivers and their feedback to our engineers has proved crucial in this.

"This announcement gives us excellent stability for 2015, but of course we are very much focusing our attention on maximising the full potential of the FW36 in the remaining seven races of this season."

Massa joined Williams from Ferrari at the end of last year, while Bottas has been with the Grove squad since being appointed as a test driver in 2010.

"I'm really enjoying my time at Williams Martini Racing and I feel settled here," said Massa, who made his F1 debut back in 2002. "Williams is such an iconic name in motor racing and I have a lot of pride when racing for this team.

"This season we have started to show our true potential and I'm driving a car that is looking strong and has improved a lot as the season has progressed which is very encouraging for the future. It's important that we continue to push in the second half of the season and that we start 2015 with some really good momentum that we can build on."

"I've been a member of the Williams team for five years now and we have developed together throughout that time which is a great feeling," added Bottas. "The team has also made some very impressive gains this season and I'm confident that I'm at a team that is moving in the right direction and can continue to be competitive.

"Sir Frank and Claire have put a lot of faith in me and I'm very grateful that they continue to do so. Felipe and I have a good working relationship and this early announcement will help us both input into the ongoing development of the FW36 and the FW37."

The team added that it will announce its test and development driver roles for 2015 in "due course". Felipe Nasr and Susie Wolff are currently on the books.