Austrian test driver Alexander Wurz will replace Australian Mark Webber in the Williams race line-up next season, the Formula One team announced on Wednesday.
Germany's Nico Rosberg, son of 1982 world champion Keke, will remain with the British-based team after an impressive rookie season.
Webber, managed by Renault team boss Flavio Briatore, faces an uncertain future but has been linked to the world champions and other teams.
Wurz, who was classified in third place for McLaren at Imola last year in a one-off appearance as a stand-in for the injured Colombian Juan Pablo Montoya, was a Formula One regular with Benetton from 1997 to 2000.
The 32-year-old moved from McLaren, where he had also been a test driver, to Williams this year and was delighted to be returning to racing.
"My natural habitat is racing, so I couldn't be happier to have received Williams' vote of confidence for this job," he declared in a statement before the weekend's Hungarian Grand Prix.
Team boss Frank Williams, who denied last weekend that Wurz had a clause in his testing contract guaranteeing him a race seat, talked up his driver choice as part of the 'cornerstones of a competitive team' being put in place.
The team announced a new three-year engine deal with Toyota last week.