"This year I suppose I have to call Kimi the star driver, with the equipment he had," Ecclestone wrote in a foreword to the official 2013 Formula 1 season review.
"I think he was motivated on hope that he was going to get paid. He's a good guy to have in a team, good for us, good for the team. He's super, he's a racer."
Next year Raikkonen will return to Ferrari, the team with whom he won the 2007 World Championship.