"We had what looked like an electrical problem", he confirmed.
Throughout the weekend in Montreal, however, Max has been back at his best, leading the three practice sessions and then producing an excellent lap in Q3 to take third on the grid for the race, despite his rivals upping their engine modes. But so far the situation in this group is very conditional, as Nico Hulkenberg, who became the 14th, lost to Grosjean 0.3 seconds.
"I would say Merc are going to be the favourites" said Ricciardo.
Ricciardo's auto has spent more time in the garage than Verstappen's this weekend, but Ricciardo does not think he can use too much of that as an excuse for the gap to the Dutchman. Kimi Raikkonen in the other Ferrari and Monaco victor Daniel Ricciardo are in the third row.
"I think he's pretty headstrong; he won't let it get to him too much", said the Australian, who won in Monaco and now sits in third place, 38 points behind Hamilton, in the standings.
But after the dreary spectacle in Monaco a fortnight ago, at least we can rely on one of the finest overtakers in the sport fighting his way back through the field to provide the entertainment this weekend.
Ricciardo added that Red Bull's plan is to one-stop, but that relies on both drivers managing to make the hypersoft last long enough. We got a few laps at the end there so I did enough to feel what the vehicle was like.
Verstappen, who also spun out in Australia and finished sixth, said he's not going to change the approach that made him, at the age of 17, the youngest driver ever to compete in Formula One.
"We have the B-spec engine this weekend, the upgrade, and I think just configuring a few things on that, we're not necessarily aligned, so we just had to go through a little bit of trial and error". "I think it would have been a close fight for the pole with the new engine".
Asked about his driving style after arriving in Montreal, he said, "I get really exhausted of all the questions". The auto has been working really well and we know in qualifying we are missing top speed.
"It's probably the first time in a while that we have gained really good team points so it's a good weekend from that perspective and also good for Max".