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The Mercedes board has decided not to supply Formula 1 engines to Red Bull in the future, AUTOSPORT understands.

The news comes the day after it emerged Red Bull will not use Renault power next year, despite having a contract in place with the French manufacturer through to the end of 2016.

Red Bull is understood to have issued a document requesting a termination of its agreement that will be accepted by Renault.

Given the severe breakdown in the relationship between Red Bull and Renault, given the unreliability of the French manufacturer's power unit, the former approached Mercedes enquiring about a supply.

The Mercedes board has now looked at it, with AUTOSPORT sources confirming Daimler chairman Dieter Zetsche has decided to bring the tentative discussions to an end following his visit to Monza for the Italian Grand Prix at the weekend.

The thinking behind the move is Mercedes has waited 60 years to find itself in such a position back at the top of F1, and it has no intention of helping out a team with Red Bull's resources become a serious challenger to its success.

When asked ahead of the Italian GP weekend if Mercedes should supply Red Bull with engines, reigning world champion Lewis Hamilton expressed doubts.

"If we're serious about winning the world championship, probably not," said Hamilton.

"Red Bull is a great team, but it's like giving Ferrari our engines.

"We don't really need it. We are good where we are."

Only recently Mercedes motorsport boss Toto Wolff told AUTOSPORT the matter was up in the air as there were pros and cons to the prospect.

At the time, Wolff said: "Supplying one of your championship contenders with big resources, it needs to be carefully judged and balanced as to whether we would want to do that.

"But then from a global perspective, Red Bull is a really phenomenal brand that attracts younger audiences and consumers.

"Therefore you cannot wipe it off the table and say, 'From the team's perspective it doesn't make any sense, so we are not looking at it'."

It would appear to leave Red Bull with the sole fall-back option of getting Ferrari engines, although as of last week it is believed no approach had been made to the Italian marque.