Red Bull Racing's Sebastian Vettel believes the Italian Grand Prix weekend will be 'very tight', even though he dominated the first day, finishing the second practice session more than half a second up on the rest of the field.

The German, who is chasing his fourth title this season and who of course won last time out in Belgium, will be after his sixth victory of the year at Monza in a bid to extend his already considerable 46-point cushion.

Speaking after Friday's action, Vettel added that there are still a few tweaks that need to be done to optimise the RB9.

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"It will be very tight this weekend, as we saw in the first practice," Vettel said. "It will be close tomorrow in qualifying with quite a few cars separated by only a few hundredths of a second.

"There are a few things we still need to do to optimise the car, as there are two or three corners where we are sliding more than we would like. It's positive today, but it's only a Friday," he stressed.

Mark Webber meanwhile was eighth in FP1 and second in FP2, 0.623 seconds slower than his team-mate - and he is also cautious.

"We seem okay here, although it's only Friday," added the Aussie. "We seemed good on Friday in Spa and then everyone was with us in P3.

"But, that said, the car feels good although we have some work to do to prepare for the race, so let's see tomorrow."