Michael Schumacher is confident Mercedes are quicker than their lap times showed during Friday's practices in Montreal.
The seven-time World Champion, who is bidding to become F1's seventh race winner for this season in Canada, finished Friday's running in seventh place.
Schumacher's best time, a 1:15.697, was 0.438s slower than Lewis Hamilton's P1 time, while his team-mate Nico Rosberg was a further two-tenths down.
However, Schumacher reckons Mercedes are closer to the front than their times indicated.
"It was a bit of a compromised approach because this rain we have right now was supposed to be all day long," the 43-year-old told Autosport.
"We took the opportunity - thinking it was going to be wet in the afternoon - to compromise the way we use the tyres.
"We didn't have the option tyres available in the afternoon because we had used them in the morning.
"So it doesn't represent the quickest times in the end.
"What does it mean tomorrow? We'll find out. We are certainly not far off."