Sergio Perez says Force India needs to keep maximising its potential in every race as he expects the battle for fourth in the F1 world constructors' championship to keep switching with Williams.

Perez has accepted Williams had an edge over Force India at the high speed Monza track but feels his team scored its full potential of points with his eighth place backed up by Nico Hulkenberg's tenth.

Click here for full Italian GP race results from Monza

With Williams grabbing sixth and ninth it has moved back ahead of Force India in the battle for fourth in the teams' championship by five points heading to Singapore.

"We simply didn't have the pace today to have more points," Perez said. "We tried to stop quite early, we were really optimistic for the last stint, trying to cover Verstappen, but it was just far too early. In the end we nearly lost a position to Massa which would have been a disaster but in the end we managed to hold the position.

"Definitely this weekend we were not as strong as expected. Williams was quite quick so hopefully we can come back as strongly at Singapore and keep the challenge on them."

With seven races remaining Perez predicts the battle will ebb and flow depending on circuit characteristics but is confident if Force India continue to produce its gains from recent races it can secure its best finish in an F1 season.

"We've seen a couple of races where they're stronger and we're stronger, but the important thing like from today is we maximise the potential, we score as much, as many points as are available to us," he said.

Latest Tweets from & GPF1rst