Finnish driver Heikki Kovalainen will replace countryman Kimi Raikkonen and race for Lotus in the final two races of the season.
Raikkonen will miss the United States Grand Prix and Brazilian GP to undergo back surgery. He is joining Ferrari next season.
The 32-year-old Kovalainen has raced in 109 GPs for Renault, McLaren, and Caterham, securing one win at the Hungarian GP in 2008 and three other podium finishes. He has been a test driver for Caterham this year.
Kovalainen says "jumping into a car so late in the year when you have not been competing in the races all season will be a challenge."
His appointment comes after seven-time champion Michael Schumacher turned down an offer to drive in the final two races.