Felipe Nasr has been named as the new Williams test and reserve driver for the 2014 season.

The Brazilian joins the team following two years in GP2 in which he finished tenth in the 2012 championship and fourth last year. Williams has been searching for a reserve driver since it promoted Valtteri Bottas to a race seat at the start of 2013 and Nasr will take part in three tests and five FP1 session as well as attending every grand prix this year.

Nasr will immediately get down to work as he drives on the final day of the second test in Bahrain and said he is excited by the opportunity.

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"I'm really happy to be joining the Williams family," Nasr said. "They have a great history in the sport and some of the greatest Brazilian drivers of all time have driven for the team, so it's an honour to join names such as [Nelson] Piquet, [Ayrton] Senna and [Felipe] Massa. This is a fantastic opportunity for me to make the next step in my career and I can't wait to get behind the wheel of a Formula One car for the first time in Bahrain."

Team principal Sir Frank Williams said Nasr had been Williams' radar for some time.

"Felipe has a strong track record of success in his career so far and we have been watching him closely for a while," Williams said. "We have a track record at Williams of bringing through new talent and giving them a chance to show what they can do on the world's biggest stage. By driving in five FP1 sessions this season, Felipe will have the perfect chance to showcase his skills and I'm confident he will be a strong addition to our driver roster."

The deal comes at the same time as one of Nasr's backers - Banco do Brasil - is confirmed as a new Williams sponsor.