Valtteri Bottas is confident his new-spec Mercedes engine will remain in the back of his W09 for the remainder of the weekend despite the unit suffering a water leak issue on Friday.
The Finn sat out the final 30 minutes of yesterday's second free practice session when his Mercedes crew discovered the engine problem.
An initial diagnosis did not reveal any visible damage to the new power unit but the team had yet to undertake a extensive analysis of the failure.
The new-spec engine has undoubtedly brought an extra boost of speed to the Silver Arrows squad, as Hamilton's impressive Friday pace clearly demonstrated.
"Practice 2 was problematic as I only got a few laps in the beginning then we had a water leak with the engine which we are still investigating," Bottas explained.
"It is the new spec and it definitely felt fresh but we now need to find out the cause of the water leak but I think we are still confident we can run it for the rest of the weekend which is good."
Mercedes' upgraded engine was initially scheduled to be introduced in Montreal, but a quality issue pushed back its debut to France. A delay the German manufacturer put to good use by further optimizing the new specification.
"It felt good. We are not running it yet in full power so there is more to discover tomorrow but in normal running it felt fresh and nice and a bit better than the old one," said Bottas.
"We definitely looked competitive today in both sessions and Lewis got a really good lap in FP2 so I think we are going to be competitive.
"But we’ve seen on Fridays that Ferrari have been sandbagging so I think they are doing it again but let’s see for Saturday and Sunday."
Gallery: The beautiful wives and girlfriends of F1 drivers
Keep up to date with all the F1 news via Facebook and Twitter
