Sauber has announced Felipe Nasr will team up with Marcus Ericsson in an all-new driver line-up in 2015.

The move leaves both Adrian Sutil and Esteban Gutierrez without a drive for next season, despite Sutil having had a contract in place. Nasr - currently second in the GP2 championship - leaves his reserve driver role at Williams to take the race seat at Sauber, bringing backing from Banco do Brasil, and said he is excited to follow in the footsteps of established F1 drivers.

"It is a very important step in my career to sign with the Sauber F1 Team for the 2015 Formula One World Championship," Nasr said. "This is an unforgettable moment that I owe to all of those who have supported me - my family, my friends, my sponsors, my teams and my country. Today the dream has come true.

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"Sauber was responsible for the arrival in F1 of great names such as Felipe Massa, Kimi Raikkonen, Robert Kubica and Sebastian Vettel. I am proud now to also be part of this racing family. I had a wonderful year at Williams Martini, where I learned a lot and prepared myself to be a race driver in Formula One."

Team principal Monisha Kaltenborn added that Nasr had stood out in lower formulae, and was pleased with the new partnership in Brazil that the move has opened up.

"We have been following Felipe's career path for some time now, and he fully deserves his position in Formula One having had a very successful career in junior categories," Kaltenborn said. "We are happy that he will be driving for our team next year. This means that Brazil will have one more young and talented driver in the sport. Banco do Brasil has been an important partner for Felipe so far, and we are delighted that such a renowned company is continuing to support him during this important step. We look forward to this partnership."