"We wanted to use the second power unit this weekend, but a quality problem means we've moved it to the French grand prix", a spokesman is quoted as saying by the German media.
"Naturally I'm still here to win, but if they've got upgrades in their engines, which can be from a tenth to two tenths, Ferrari are particularly very strong on the straights".
That display of emotion confirmed Hamilton's unchallenged supremacy in Montreal, but he faces a much more hard challenge from rivals this weekend as the leading teams take their scheduled revised second engines of the season.
The biggest being the tyres, as the same Hypersoft, Ultrasoft and Supersoft compounds used in Monaco will be available again in Canada.
"So all Mercedes-powered cars will be running PU1 for this weekend, too, before receiving new units in France".
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The Scuderia could also face a reduced threat from Red Bull as their vehicle is likely to be less suited on the long straights, though will be strong in the many heavy braking zones.
Stroll has only four points through the first six races from an eighth-place finish in Azerbaijan.
"There are tracks where each driver has strengths and weaknesses", Hamilton said.
Asked about his driving style on Thursday after arriving in Montreal, he said, "I get really exhausted of all the questions".
Asked if he expected Ferrari to have an advantage in Canada, Hamilton replied: "Yeah, and then also particularly if they do bring their upgraded engine".
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Thiem sent Cecchinato scurrying around the court before breaking decisively for a 6-5 lead with a lovely forehand victor . He's a player that can be adapted more to the clay, it will be tough".
But others have also found the track to their liking including two of Hamilton's biggest challengers. They had originally planned to introduce significant upgrades for this weekend's Canadian Grand Prix.
Both Toro Rosso drivers, Pierre Gasly and Brendon Hartley, will have an upgraded Honda engine.
In the morning session, Williams driver Sergey Sirotkin spun and hit a wall, but was able to continue.
And for Lance Stroll, this marks his second trip to his hometown as an F1 driver and he'll have good memories having scored his first points there 12 months ago.
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Bottas played down the delay to the new engine, saying it would have been only "a small gain compared to the old one" anyway.