Valtteri Bottas admits he was surprised Red Bull was so quick during Friday practice for the Italian Grand Prix.

Both Red Bull cars finished in the top ten during FP2, with Sebastian Vettel just 0.004s behind Bottas and half a second slower than the pace-setting Mercedes of Nico Rosberg. While Red Bull was quick in Spa - where Daniel Ricciardo won - the team was able to run a low downforce set-up on that occasion to negate its power unit disadvantage. In Monza, every team is running low downforce set-ups and when Bottas was asked by about Red Bull's pace he replied: "Yeah, not bad!

"It's quite impressive. We will see tomorrow if that was everything they have or not, because we should definitely still have a bit more pace to come tomorrow."

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Bottas made clear progress from FP1 to FP2 and he revealed a suspension issue had hampered him during the morning session.

"We just went through the programme in FP1 and actually after FP1 we found a small problem - a mechanical issue with the suspension - with the car. We fixed it for FP2 so that also gave me more confidence with the car and it felt much better because then it was working like it should. In FP2 we also improved the balance and especially the long run felt good today so that is a positive thing."

While encouraged by the steps Williams has made, Bottas was unwilling to say pole position was a realistic target on Saturday.

"It's difficult to say; you never know how much [Mercedes] still have left for tomorrow. I really think we should be aiming for top three in qualifying and if it's possible for pole that's nice, but it's impossible to predict at the moment."