Three-time F1 champion Sir Jackie Stewart reckons Fernando Alonso will again miss out on the drivers' title this season as the Ferrari simply isn't good enough.

Alonso sits third in the Drivers' Championship heading into this weekend's Belgian Grand Prix at Spa-Francorchamps.

To date the Spaniard has taken two wins and three further podiums, and currently has 133 points on the board, just one less than Kimi Raikkonen, who is second. However Sebastian Vettel has a 39-point buffer and given Red Bull's form and that of the Scuderia, which has been rather below par in recent races, the signs are not especially good.

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"The Ferrari has to be a better car before Alonso can seriously look at the championship and I don't think that can be achieved this year," Stewart told the Indo-Asian News Service, when asked whether or not the 32-year-old can add to his two-titles this year.

Meanwhile, Stewart went on to say that in his view Vettel remains the favourite, even though Mercedes have made up ground of late.

"It's very clear that the Mercedes, under the direction of Ross Brawn, are constantly getting more competitive. But I am sure that Adrian Newey will still keep Vettel and Red Bull competitive enough for the constructors' and drivers' championship," Stewart continued.

"Lewis Hamilton drove an extremely good race at Hungary [to win]. He was both fast and aggressive and the Mercedes certainly worked that day.

"However, I would still have to bet on Vettel for the title as Mercedes have not yet stabilised their performance and that applies to both Lewis and to Nico Rosberg," Stewart concluded.