Williams have announced that their test driver Kazuki Nakajima will take the place of Alexander Wurz for the final Grand Prix of the season in Brazil.
Nakajima has been with Williams since November 2006
The 22-year old Japanese driver is the son of Satoru Nakajima, who raced for the Lotus and Tyrrell teams in the late 1980s and early 1990s.
Nakajima said: "This is a chance I intend to grab with both hands."
Wurz announced his immediate retirement from the sport on Monday, citing doubts about his desire to continue.
The Japanese driver has been with Williams since November 2006 and has already represented the team at five Grands Prix as a Friday driver.
Despite being the 2007 Rookie of the Year in the GP2 series, team principal Sir Frank Williams said promoting Nakajima wasn't done with a race seat for the 2008 season in mind.
He said: "You cannot assess a driver's capability on the basis of one race but this is an ideal opportunity to develop Kazuki's experience."
Nakajima added: "I am very grateful to the team who have given me this opportunity. I hope to repay their faith with a strong performance."