Sauber drivers Marcus Ericsson and Felipe Nasr have both apologised for their role in the intra-team collision during Sunday's Monaco Grand Prix.
Nasr was asked by Sauber to allow Ericsson to pass, albeit with the caveat that the Swede would be require to pull over if he was unable to make progress.
As Nasr queried the call, Ericsson attempted an overtaking move which resulted in the pair colliding at La Rascasse, ultimately retiring from the race.
Ericsson was given a grid drop for the Canadian Grand Prix, while team boss criticised the pair's "unacceptable behaviour," as both drivers apologised.
"A very disappointing end to the race," said Ericsson.
"We had taken a bit of a gamble, so I was first to pit for slicks. It worked out, but it was not ideal as I was caught out by blue flags.
"I had to go off the line and let other drivers pass, which meant I struggled to get the temperatures up in my tyres. When the tyres started to work, I caught Felipe, but got stuck behind him.
"I was told that Felipe received a call via the radio. Then I saw a gap and tried to overtake him, but we all saw what then happened.
"It is a difficult situation for us, and it is even more important to stick together as a team in these times. I apologise, and I am sure that this will not happen again in the future."
Nasr explained his viewpoint and also offered his apologies.
"It is the worst scenario that can happen for us as a team," he said.
"Marcus and I were on different strategies, so his second pit stop was earlier than mine. My tyres started to get up to temperature, and I was catching the cars in front.
"For me it was not the right timing to swap positions. Suddenly, in Rascasse I felt my car being hit. It is surely disappointing for everyone as the whole team works very hard. I apologise for what happened."