Vitaly Petrov has vowed to improve following his return to the newly-renamed Caterham F1 team.
The Russian was let go by Lotus Renault last year after two seasons, but has returned to Tony Fernandes's outfit to partner Heikki Kovalainen.
"The winter was quite difficult for me," the 27-year-old told Sky Sports. "It was a long winter - I was waiting three months before announcing what I will do in the future. Now I am much more happy.
"Of course, I will improve with a new team like Caterham. They have a big future and like you see what they did in the last two years, they are improving every year their car.
"They have a lot of new guys working and this summer they will move to a much bigger factory. This team looks really strong and they have a big ambition for the future."
Lotus Renault was rebranded following owner Tony Fernandes's acquisition of Caterham Cars.
