Although the Milton Keynes-based team had been expected to wait until the Austrian GP to make its final call on the 2019 engine decision, indications now suggest that senior management has made its mind up.

Following close evaluation of the performance steps made by both car manufacturers over the Canadian GP weekend, and well aware that Renault could not guarantee it could keep its engine supply offer open, Red Bull is set on committing to Honda.

It is understood its decision was communicated to external parties late on Monday night.

Red Bull was unavailable for comment, and it is unclear when the move will be made official, but there are suggestions it could come before this weekend's race in Paul Ricard.

Motorsport.com understands that Red Bull has elected, after more than a decade with Renault that yielded all its world championships, to throw its focus in with Honda instead.

The move will come as a blow to Renault which had been hoping to keep Red Bull on board to act as a benchmark for its own works team.

Speaking at last weekend’s Canadian GP, Renault F1 managing director Cyril Abiteboul said “I understand what they are looking to get.

“They are looking to the technical and commercial side, because it is clearly different remaining a customer and partner of Renault versus becoming a works team with Honda.

“It is very different and I appreciate that. But frankly, as far as I am concerned, they have a chance with us to become world champion again. I cannot say for Honda.”

Honda has made impressive progress this year, though, following its split from McLaren at the end of last year.

An upgrade at the Canadian Grand Prix delivered a significant performance step, despite the dark cloud of Pierre Gasly needing a replacement engine following a problem in final practice.