Montreal wasn't kind to Mercedes in 2014 with Hamilton encountering brake issues that forced him to retire after 46 laps.
"All Mercedes-powered cars will be running PU1 for this weekend, too, before receiving new units in France".
All three have won two races so far this season.
Hamilton has 64 victories from 214 races and is second in the all-time list behind seven-times world champion Michael Schumacher (91).
If that was to happen the pressure would be on Max Verstappen to put the multiple mistakes he has made in 2018 behind him and lead the charge for the Milton Keynes outfit, potentially trying to take advantage of any weakened rivals ahead.
"There are tracks where each driver has strengths and weaknesses", Hamilton said.
It will be a big weekend at the track, which is celebrating the 40th anniversary of the event's move to the island circuit across from downtown Montreal.
Despite a poor weekend in Monaco, Haas is bringing a significant upgrade for this weekend and with the updated Ferrari engine will likely be a threat once again.
Vettel's sole Montreal win has been backed up by three pole positions at the circuit, achieved in 2011, 2012 and 2013, while Alonso is the only other polesitter on the current grid, accrued in 2006.
Renault, which supplies its own team as well as McLaren and Red Bull, and Toro Rosso's partner Honda are planning to bring upgraded power units to Canada. Williams rookie Lance Stroll continued Canada's impressive run of backmarkers into the points, as the Canadian finished P9 after starting P17 in his first home F1 race. "For us, it's a tough one to take, but there are lots of lessons to be learned so we can come back stronger next time".
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