Gasly was trying to finish his fast lap towards the end of the session when he came across a gaggle of cars heading into the final corner, including Sainz, who was moving very slowly and was about to start his own lap.
Gasly had to abandon his lap and failed to progress out of the session in 17th place, while Sainz – who qualified eighth – later received a three-place grid penalty for impeding the Alpine driver.
The Montreal incident came after Gasly was himself penalised for impeding both Sainz and Max Verstappen in qualifying in Spain, although ultimately neither driver’s grid position was affected.
“I just think it's completely unacceptable to be driving the way Carlos did, it's just as simple as that,” said Gasly when asked about Sainz by Autosport. “Coming at 300, he’s sitting at 30kph in the last chicane just focusing on his own lap.
“But you're not alone on the racetrack. First of all, I could not even close the lap, which would have put us in a top six quite easily.
“And second of all, it was extremely dangerous, and it was just unnecessary. So I'm just absolutely gutted.”
Source: Autosport