Romain Grosjean labelled Carlos Sainz's move at the start of the Canadian Grand Prix as "pretty dangerous" following their crash that also took out Felipe Massa.
Sainz crashed heavily into Felipe Massa and then into the wall at Turn 3 after losing control of his Toro Rosso when he made contact with the Haas of Grosjean on the exit of Turn 2.
Grosjean was on the inside of Sainz when they made contact, and both men have been summoned by the race stewards as they investigate the accident.
"There's not much to say. I was on the inside, Carlos was on the outside and then he turned twice to the right," Grosjean told Autosport.
"First I went on the grass, and I managed to come back on track and he hit me a second time.
"It's pretty dangerous to me. Luckily there wasn't much more happening in Turn 3 because it could have been pretty bad."
Sainz argued that Grosjean was in his blind spot and had no idea the Haas car was there.
"I never realised a Haas was in my dead angle in the mirror and we collided and I was simply a passenger into Felipe, probably the most unfortunate guy out there today apart from Romain and myself," he said.
"Exiting Turn 2 I checked the mirrors, I saw the Renault and another guy two or three car lengths behind and I didn't put them in consideration when I was attacking Fernando [Alonso] and suddenly I had Romain there.
"If I look back now there's actually nothing I could have done differently because when I checked my mirrors I never saw Romain on the right side."
While Sainz and Massa retired on the spot, Grosjean went on to score a point by finishing 10th, having done almost the entire race with a set of supersoft tyres he switched to when he pitted after the crash.
Massa said Sainz had explained his side of the accident to him, and he accepted the Spaniard's view.
"I was getting to the corner, then suddenly a car just hit me really quick," said Massa.
"I was thinking maybe someone lost their brakes, because it was a big crash.
"Then I spoke to Sainz and he said he was sideways because somebody touched him, and then I saw that on the TV.
"Then the only car he hit was me - it's a shame."