Mercedes very concerned about engine problem that hit Stroll

Mercedes boss Toto Wolff has revealed that his team have "lots of concerns" about the engine issue that caused Lance Stroll to have to return to the garage in FP3, when his engine burst into flames.

Mercedes have brought a Spec-2 engine to Montreal, which all Mercedes teams are using, and the works team are concerned that they will be struck down by a similar problem.

Wolff told Sky Sports: “We have lots of concern about the engine problem.

“We don’t know yet what really happened it just went up in flames. A brand new engine on an out-lap, it wasn’t even on full throttle.

“So we need to investigate and analyse what that was and cross our fingers that it doesn’t happen on our cars.”