Rumours of a pit garage fight have marred Sahara Force India's 100th grand prix weekend celebrations.
In Monaco, angry with the Silverstone based team's qualifying strategy, Paul di Resta said publicly: "I'm not going to say much because I'll say something I probably shouldn't."
But two weeks later, on Saturday in the wake of qualifying in Montreal, the 27-year-old Scot allowed his frustration to spill over.
He said Sahara Force India's handling of the session that left him 17th on the grid was "clearly not acceptable", accusing his team of leaving him stranded in the pits with a minor problem when the track was at its driest.
A day later, rumours were swirling in the paddock of the Circuit Gilles Villeneuve of fisticuffs in the Force India garage, the daily Mail reporting that it might have been between di Resta's trainer and a team mechanic.
Telegraph correspondent Tom Cary said Sahara Force India "admitted that a disagreement had occurred", but denied it was related to di Resta's criticisms.