Max Verstappen admitted it was not an "ideal" start to his Canadian Grand Prix after enduring technical trouble with his car on Friday.

The practice session in Montreal was heavily disrupted by intermittent rain, causing the headline lap times to be effectively meaningless.

However, Verstappen, who was 18th fastest in the second session, suffered a problem with the energy recovery system (ERS) in Practice Two after just four laps, with the Red Bull trailing smoke before returning to the pits.

Red Bull are investigating the cause of the fault ahead of Saturday's qualifying.

"It's not ideal," said Verstappen.

"I would have liked to drive more laps, some other people had a few more laps in the dry and a few more laps in the wet.

"It's definitely not how I would have liked to get on in FP2 but it's more important to figure out what actually happened and what kind of implication it will have for this year and the rest of the year."

Verstappen has won just one of the last three Grand Prix, with Red Bull now holding just a 24-point lead over Ferrari in the championship.