Fans of Formula 1 are familiar with the names McLaren and Mercedes, as both were synonymous from the mid-90s onwards before the former opted for Honda power units (again), and later on, choosing Renault as their engine supplier.
However, McLaren's Renault contract is up at the end of next season and they have opted to instead return to Mercedes, who had been their supplier with considerable success from 1995 until 2014.
Ferrari will supply three teams (their works team, Haas and Alfa Romeo), Honda two (Red Bull and Toro Rosso), while Renault will have only its factory team running its engines.
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"McLaren have been putting in place the building blocks of their revival over recent seasons, including impressive performances this season with Renault power".
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But the team made a decision to switch to Honda as their engine supplier in 2015 as it brought with it works team status and rekindled a very successful partnership of the past.
It has already announced ambitious plans to build its own wind tunnel at Woking and, aware that the new rules from 2021 offer it a great chance to get back in the mix at the front of the field, its engine options have been closely looked at.
"We are delighted to welcome McLaren back to the Mercedes-Benz racing family with this new power unit supply agreement", said Mercedes' motorsports head Toto Wolff in a joint statement with McLaren issued at the Russian Grand Prix on Saturday.
Renault managing director Cyril Abiteboul added: "Since our partnership began, McLaren has gone from ninth to fourth position in the constructors' championship".
The McLaren and Mercedes-Benz engine deal will see the return of the partnership between the two marque entities that ended in 2014. 2021 will be a crucial season for all teams and it is important for us to have a precise and clear view of the strengths and ambitions of our competitors going forward. "We enjoy being a works team".
The confirmation of an extra customer deal with Racing Point would therefore require approval from the governing body, but this would likely be a formality.