Heikki Kovalainen is to replace fellow Finn Kimi Raikkonen at Lotus for the final two grands prix of the current Formula One season.

Raikkonen announced on Sunday he would be pulling out of the races in the United States and Brazil to undergo back surgery to cure a long-standing problem.

After failing to lure Michael Schumacher out of retirement for a second time, and Nico Hulkenberg from Sauber, Lotus have turned to Kovalainen who has competed in 109 grands prix, with his last a year ago for Caterham.