Mercedes Motorsport boss Toto Wolff says his team must remain very wary of the threat posed by Ferrari after Sebastian Vettel took a substantial chunk out of Lewis Hamilton's championship lead in the Hungarian Grand Prix.

Vettel and Ferrari's second win of the season at the Hungaroring, coupled to a drama-filled race day for Mercedes have seen the German reduce the margin to the front to 42 points, while he is also just 21 points in arrears of second place Nico Rosberg.

Indeed, though it is only the second time this season that Ferrari has taken the fight to Mercedes, Vettel's sheer consistency has enabled him to keep touch with Hamilton and Rosberg to the point he can't quite be discounted from the title reckoning.

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With this in mind, though Wolff remains certain the trials and tribulations of an error-strewn Hungarian Grand Prix won't necessarily be repeated, it is a reminder of the challenge Mercedes faces when it is under pressure.

"You just need to be careful," he told Sky Sports F1. "We're just 42 points ahead in the Drivers' World Championship and you can see how quickly it goes. You have a bad day, two cars not scoring good points and 'boom' you go backwards. But that is a mentality we're having anyway of always being a bit sceptical about how we are doing."

Despite the best efforts of Ferrari, Mercedes remain far better placed in the constructors' reckoning though, with the German marque enjoying a 147 point advantage over the Scuderia.