Williams driver Valtteri Bottas conceded that Ferrari was out of reach after the team locked out the third row of the grid at the Italian Grand Prix.
Bottas set the sixth fastest time during Saturday's qualifying, two-tenths behind team-mate Felipe Massa, who finished on the podium at Monza in 2014.
"It wasn’t a perfect qualifying as I didn’t get a great slipstream in the final lap," said Bottas.
"I think fifth and sixth was the maximum as the Ferraris were just a bit out reach.
"Tomorrow is a new day and we will certainly do everything we can to challenge them. The race pace looks strong so I am after a good result."
Massa is nonetheless optimistic that Williams' long-run pace will enable it to fight for the podium.
"Ferrari was maybe a little bit too quick today, and even with a perfect lap it would have been difficult to match them," he said.
"I'm still happy with our performance and where we are. Power is very important on this circuit so we may be able to fight with Nico [Rosberg] but it is a long race.
"I have my sights on the podium but most importantly we must have a good race, scores some valuable points and make sure we make no mistakes."