Nico Rosberg says that his Mercedes team needs to be wary of a renewed threat from Ferrari after Sebastian Vettel and Kimi Raikkonen split the Silver Arrows in free practice for the Canadian Grand Prix.

Ferrari 'spent' three of its remaining development tokens on the V6 between the races in Monaco and Canada, and the work appeared to have paid off as both its drivers put in strong run early in the rain-affected second session in Montreal. However, with almost an hour of running lost to the weather, Rosberg admits that no-one can be sure just how close the battle will be.

"Ferrari seems to be pretty quick so that's a threat at the moment, but let's see where we are on Saturday," he reasoned, "I need to have a chat with the engineers to see what they think. They know much more than we do about what it really looks like because they have all the data, how much they were turning up their engine compared to ours, how much fuel they had on board and all these things. That means more than the times to be honest."

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While Mercedes team-mate Lewis Hamilton topped both sessions, he also ended his day in the tyre wall after an ill-judged decision to send both cars back out onto a wet track to practice starts. Rosberg avoided a similar fate and was able to return to the garage unscathed, insisting that his programme hadn't been compromised by the onset of increasingly heavy rain.

"Not much actually," he confirmed, "We knew it was coming, so we just anticipated everything and got through everything. We did the qualifying prep, practiced for the race. The engine was okay. There was no graining on the tyres - they were more robust so Pirelli has done a good job with that and I think tyre life will be pretty straightforward."