Nico Rosberg says he is convinced his Williams team will back in competitive form in the next race in Singapore after struggling in qualifying for the Italian Grand Prix.
For the first time this season, Rosberg failed to make it past Q1 and will start the Monza race from 16th position.
But the German is sure Williams's lack of pace is just down to the nature of the track and he expects his team to be strong again in the upcoming race.
"I started to find a bit more competitiveness during qualifying today and we made all the right decisions such as choosing the soft tyre, but I didn't manage to put the ideal lap together as the car has not been at its best all weekend," said Rosberg.
"Although we had a tough time with the car last race and we will struggle a lot here this weekend, I am convinced things will improve for Singapore and we will be back where we were in Valencia."
Kazuki Nakajima qualified right ahead of Rosberg, and the Japanese claimed he could have made it to Q2 had it not been for traffic.
"It was a tough qualifying session for us - we knew it would be, but that doesn't change the disappointment," he said. "The gap to making it into Q2 was very small and perhaps without hitting traffic on my last lap, something more might have been possible to give me a better start position for the race."