Toro Rosso team boss Franz Tost has said he doesn't think there will ever be another F1 driver like current champion Sebastian Vettel.

Vettel joined the Italian team from BMW in 2007 and went on to secure victory at Monza the following year before being promoted into the Red Bull line-up for 2009.

Having gone on to secure the championship title last season, Vettel looks odds-on to take a second straight crown this year with a bumper lead in the standings and Tost insisted that he didn't think there would a young driver coming through the ranks who could be compared to the champion.

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"Sebastian came to us with quite a bit of F1 experience, so he was not the complete newcomer," he told the official F1 website. "He'd been a test driver with BMW-Sauber and had already done a race where he'd got his first point. Then he came to us with a rather unusual level of experience for a Toro Rosso driver, and that showed in his first full season when he won the Italian Grand Prix.

"There will never be another Sebastian Vettel, just as there will never be another Michael Schumacher or Ayrton Senna. What I think is crucial in the development of a driver from rookie to serious podium contender is that the driver discovers himself. There is no such thing as the unerring talent scout. Sebastian Vettel has become world champion because he has discovered himself - his own capacity and ability.

"The outside world can only provide the necessary environment, but it is always the driver who makes a team's success."

Tost added that Vettel's best chance of future success was to remain with Red Bull in the coming years and not consider a move elsewhere, with the rumour mill having linked the German with Ferrari for some time.

"When you look around, the really successful drivers stay with their teams for quite some time because the process of growing together - driver, engineers, car, tyres - all takes time and once you've grown into one single functional unit you want to keep that as long as possible," he said. "When it boils down to the sheer facts, for me the driver is the key to success."