The announcement was made in the team’s motorhome at Monza, ahead of Sunday’s Italian Grand Prix.

“I’m delighted to confirm that Felipe and Valtteri will be racing for Williams once again in 2015,” explained Founder and Team Principal Sir Frank Williams, after the line-up was finalised. “Felipe is a pleasure to work with and combines raw pace with a wealth of experience, and 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 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.”

“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.”

Massa claimed the team’s first pole since 2012 in Austria, while Bottas has so far notched up five podiums.