Red Bull Racing has confirmed that Sebastien Buemi will join the team as its test and reserve driver for the 2012 Formula 1 season.
The Swiss driver was left without a racing seat for this year after Toro Rosso decided to sign an all-new line-up for the upcoming season.
Buemi, 23, had been racing with the Faenza-based squad since 2009.
On Thursday, Red Bull confirmed Buemi will continue his relationship with the energy drinks company, joining Sebastian Vettel and Mark Webber at Red Bull Racing.
"It's good to remain with Red Bull for another year and have this opportunity with the World Championship-winning team," said Buemi.
"I would prefer to be driving at the races of course, but working with Red Bull Racing on the development of their car and providing them with feedback throughout the season is the next best thing."
Team boss Christian Horner added: "It was entirely logical for Sebastien to continue with Red Bull having been a member of the Junior Team since 2004. He already knows the team well from his time with us in 2008 and has gained significant race experience over the past three years.
"He will complete important test and simulation work for us throughout the year and will be in attendance at each grand prix."
Toro Rosso said Buemi would also act as its reserve driver during 2012 if needed.