Sources close to McLaren have claimed that the Woking-based have reached an agreement with Renault to supply power units for 2018.

This would bring about the already widely intimated divorce between McLaren and Honda after a turbulent three-year partnership.

It has been suggested by sources close to the deal that McLaren have signed a three-year deal with Renault, which would provide the team with engines until the end of this current regulation era. It is understood that there will be technical parity between McLaren and Renault.

The associated deal for Toro Rosso to link up with Honda, in an effort both to keep the Japanese manufacturer in the sport and assess the Honda power-unit’s development for Red Bull’s benefit, has reportedly also been signed.

It has become apparent that in exchange for an early release from Toro Rosso’s Renault deal, the team was required to make Sainz available to the Enstone outfit. It is widely expected that Sainz will switch teams prior to the Malaysian Grand Prix next month.

This further affirmation of the multifaceted deal that has materialised in recent weeks comes after Bernie Ecclestone yesterday linked Fernando Alonso with an extended stay with McLaren amid their new Renault partnership. The former Formula 1 grandee told the Daily Mail: “The Renault deal is all done. Alonso staying is super news.

Clive Mason/Getty Images Sport

“But I can’t see why McLaren will be any happier with Renault than they are with Honda. It wasn’t Honda’s fault things didn’t work out, it was McLaren’s. Every day they had a fight about everything, instead of working with them, which was a little bit stupid.”

Read Motorsport has learned that a key batch of crunch talks took place between Cyril Abiteboul, Jerome Stoll, Alain Prost, Eric Boullier and Zak Brown following FP3 at the Belgian Grand Prix. It is unclear whether McLaren will choose to announce the deal at this weekend’s Singapore Grand Prix.

Read more from William Brierty