Sebastian Vettel was handed a warning by the Montreal stewards for his part in a practice incident with Bruno Senna on Friday morning.
Approaching the final chicane at the Circuit Gilles Villeneuve, Senna was seen waving his fist at Vettel after the reigning World Champion pushed him wide as he dived down the inside.
Almost immediately word came down from race control that the stewards would look into the incident after practice.
Vettel, though, escaped punishment and was instead handed a warning by the Canadian Grand Prix stewards.
The German went on to finish the day fourth on the timesheets with a 1:15.531, which put him 0.272s down on Friday's pace-setter Lewis Hamilton.
"We ran the super soft tyres this morning thinking there would be rain this afternoon; in the end it didn't come but you never know in advance," said Vettel.
"I think we had a good day; we got decent laps and even with the different approach in terms of when we ran the tyres, I think we can be happy.
"Let's see what we can do tomorrow.
"It's a great track here, there are a lot of stop and starts, braking, chicanes and quick changes in direction but it's good fun - it's part of this track, there are bumps, so it's wild and rough, but it's fun."