The McLaren drivers go into the final five races free to race with each other and with no internal team rules hanging over them – other than not to crash with one another.
Norris had been facing undefined “repercussions” after colliding with Piastri while taking third place from him at the first sequence of corners in Singapore.
Following the crash between the two at the start of the sprint at the US Grand Prix last weekend, these have now been removed.
“There is a degree of responsibility from my side in the sprint and we are starting this weekend within a clean slate for both of us, just going out and going racing,” said Piastri.
The Australian, who won at Zandvoort, has seen his lead erode after being beaten by Norris in each of the past four races, but he said he had also been surprised Verstappen had come into the equation so quicky.
“The run of form he’s had since Monza has been a bit of a surprise,” said Piastri.
“There were flashes earlier in the season but there were also some pretty big dips. We know they have been throwing a lot of things at their car trying to improve it but he has come to the fight quicker than I expected.”
However, when asked if he was concerned about Verstappen, Piastri said: “It’s not really something I think about. He has been consistent and strong the last few weekends but there is no benefit in worrying about or focusing on that.
“The thing that’s going to help me win the championship is get the most out of myself, the car, the team. He’s there, he’s in the fight but ultimately it doesn’t change how I go about my racing.”
Norris added: “Max has had very good form the last month or so. They have been performing better than we have.
“He has won a good amount of races and he’s Max Verstappen. You’d be silly if you didn’t want to give Max a chance.
“At the minute, they are in better form, a lot of races they have been quicker. But we still have chances. We have a better car from now until the end of the season and we just have to make use of that.”
Verstappen said: “It’s clear we had a good run, definitely been enjoying it a lot more like that and we will try to carry that momentum forward. We know we need to be perfect to the end to have a chance, but we just try to maximise everything and see where we end up.”