Former long-time McLaren team principal Ron Dennis has revealed his fears for the future of F1, pointing to the financial fragility of some of the sport's competitors and conceding that he is 'very nervous about the ability of teams to sustain'.

In charge since 1981, Dennis stepped down from the helm at McLaren in early 2009, handing over the reins to his loyal deputy Martin Whitmarsh, but he continues to attend a large number of grands prix and insists he has no regrets, admitting to still being 'passionate about motorsport' - albeit concerned about what potentially lies ahead.

"I'm very, very nervous about the long-term economics of motor racing and the ability of teams to sustain - 107 F1 teams have come and gone since 1966," he told Sky News.

Dennis remains executive chairman of McLaren Automotive and the McLaren Group, and he left his F1 role to concentrate on different challenges that have included the development of the company's new road-going supercar, the MP4-12C, a ?500 million project.

"The automotive group will have three times the turnover of the racing operation," the Englishman explained. "We intend to have a turnover of ?1 billion in five years."

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