Dany Kvyat and Carlos Sainz appear to be at loggerheads at Toro Rosso after the Spaniard hit out at his team mate in Montreal for using and abusing of slipstreaming tactics.
Sainz complained that he never got the benefit of a tow in qualifying, but that plenty of others were riding his tail, starting with Kvyat.
"I was not happy about it because we are not given good chances," Sainz said on Saturday.
"When you are not being given good chances, you’re giving away four tenths on the straight, you don’t get to enjoy it much.
"It was planned for me to go in front," Sainz added.
"But to go the four sessions in front, the four times you are out in front, for me it’s not fair."
Kvyat did not see the problem in the same light however.
"We change the order the cars go out at every race and everyone in the team knows it," said the Russian.
"From my side everything is clear, so if he is brave, he should come and talk to me. But it seems that he prefers to talk to me through journalists.
"From my side I have nothing to say to him. I know that I behaved properly.
"In Baku he should be behind me but now I'm not sure I want to work with him after everything he said. I'm not sure that we want to cooperate in the qualifying."