Williams Martini Racing has announced that Adrian Sutil is to become its official reserve driver for the 2015 Formula 1 World Championship season.

The experienced German made his F1 debut with Spyker in 2007 and has made 128 starts across seven seasons since then, though he was left without a seat for 2015 when he was dropped by the Sauber team after failing to score a point in 2014.

Nonetheless, Sutil will remain involved in F1 as Williams' official reserve driver for the remainder of the 2015 season, the 32 year-old set to spend time in the team's simulator to help him acclimatise to the car should he be called up.

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"I'm delighted to have Adrian join our stable of drivers for the 2015 season," said team principal Sir Frank Williams. "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."

Sutil, whose best F1 season came in 2011 when he finished ninth overall with the Force India team, is delighted to be joining the Williams team.

"I'm very proud to be a part of such a famous and great F1 team," he said. "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."

Sutil's signing comes after Williams made it clear test driver Susie Wolff and development driver Alex Lynn would not be called up to replace a race driver should they be required. This was a scenario that very nearly occurred after Valtteri Bottas injured his back in Australia, though he has since been declared fit to compete in the Malaysian Grand Prix.