Jul.23 (GMM) A lack of sponsors are keeping former podium-getters Vitaly Petrov and Kamui Kobayashi out of Formula One.

After losing his Caterham seat and also the services of former manager Oksana Kosachenko, Russian Petrov has revealed he is now working with a new manager "from the West".

And the former Renault driver told Russia's Championat he is already in talks with several teams.

"They said that they are willing to cooperate, willing to negotiate," he revealed.

"But to continue these talks, I need some support."

Another driver currently on F1's sidelines is Kamui Kobayashi, the hugely popular Japanese who lost his Sauber seat a mere five races after standing on the podium.

Today, he is a sports car driver for Ferrari, and whilst demonstrating a F1 car for the famous marque in Moscow last weekend, he lost control and crashed.

Still, he yearns for real F1 action again.

"At the moment," said Kobayashi, "there are many teams who prefer to choose their drivers based on how much money they can bring, rather than on their ability on track.

"I hope this trend will change, because my aim is to be back there as soon as possible and I am working hard to succeed."