The German was left without a race seat at the end of last year after having driven for the struggling Sauber team alongside Esteban Gutierrez.
Williams did not have a reserve driver, something that was highlighted earlier this month when Valtteri Bottas had to sit out the Australian Grand Prix due to injury.
"I'm delighted to have Adrian join our stable of drivers for the 2015 ... Keep reading

Source: Sutil joins Williams as reserve driver


David Cottle

UBB Owner & Administrator