McLaren and Honda have played down Fernando Alonso's claim that the decision to take an upgraded engine to Canada later in June 2016 has already been taken.
The Anglo-Japanese team expected a more competitive weekend on the twisty streets of Monaco in May 2016, but Spaniard Alonso remains upbeat about what is coming.
Aiming for competitiveness
The sports daily Marca quotes Alonso as saying: "There is much room for improvement.
"We're going to Canada with some improvements, particularly with the engine. Let's see if we start to use some tokens and can be more competitive," Alonso reportedly added.
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But McLaren team boss Eric Boullier denies a decision has been taken, telling Marca: "About the engine in Canada? No, certainly not."
And a Honda spokesman agreed: "It is not decided yet."
Canada the real test
Finally, Red Bull said it is looking forward to seeing how its package fares in Canada, after Max Verstappen won in Barcelona and Daniel Ricciardo dominated almost all weekend in Monaco with Renault's latest upgrade.
Red Bull team boss Christian Horner said: "The real test for us will be in Montreal. It's a completely different place compared to the last two circuits."