Sebastian Vettel continues to urge caution over the anticipation that Ferrari can take the fight to Mercedes in the Canadian Grand Prix.

Running an upgraded engine this weekend, Vettel was second fastest in free practice, three tenths adrift of the pace-setting Lewis Hamilton, but it was his long run pace that once again caught the eye as the team looked stronger in race trim.

Despite this positive development, Vettel is nonetheless playing down the possibility of a Sunday challenge, suggesting Mercedes still has more up its sleeve given the FP2 session was compromised by poor weather.

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"They are quick, we know that, anything else would be a surprise," he said. "Of course we would take it but I think we have to wait, it was a rushed programme for everyone and it's not so clear what everyone was doing in terms of fuel loads and stuff.

"We have to be cautious - I think we can still improve but let's see what happens in qualifying and particularly the race."