Former Sauber driver Adrian Sutil has joined Williams as their official reserve driver for the 2015 Formula One season.
The 32-year-old lost his Sauber seat this year as the Swiss team opted to bring in Marcus Ericsson and rookie Felipe Nasr, with Esteban Gutierrez also axed.
Sutil revealed he was considering potential opportunities to continue racing away from F1, but has now secured a deal with Williams as back-up for Felipe Massa and Valtteri Bottas.
He said: "I'm very proud to be a part of such a famous and great F1 team. To work for Sir Frank Williams and his team means a lot to me.
"I would like to thank everyone at Williams for their belief in my qualities and the opportunity to work with such a successful and competitive outfit."
Founder and team principal Frank Williams said: "I'm delighted to have Adrian join our stable of drivers for the 2015 season. Adrian brings extensive racing experience, having competed 128 Formula One races during his career.
"Having most recently raced during the 2014 season also gives him excellent knowledge of the current generation of race car and new Hybrid power units, which is invaluable for anyone needing to step into the cockpit in 2015.
"The fight for a top constructors' championship position will be intense this season, therefore we have selected a driver with recent race experience and are confident that if the need arose, he would be a solid pair of hands to race the FW37 and assist our 2015 campaign."