It would be “inconceivable” for the Red Bull and AꦫlphaTauri teams to run with ✃different power unit suppliers after Honda exits Formula 1 at the end of 2021, according to Christian Horner.

Honda’s shock announcement that it will be leaving F1 at the end of next꧂ year has left Red Bull and its sister team AlphaTauri seeking a new power unit supplier ꦬfrom 2022 and beyond.

Both teams did have different engine suppliers on one occasion in 2018 after the then Toro Rosso team had made an early switch to Honda, whileꦑ Red Bull was still in its partnership wit✤h Renault.

SEE ALSO: Would Red Bull's main F1 rivals supply them with an engine in 2022?

But closer ties between Red Bull and AlphaT🌊auri formed via the Red Bull ‘synergy’ projects sees both teams sharing key technology, including g꧟earboxes and rear suspension elements. As a result, running two different drivetrain layouts would not be a feasible option.

"I think it's very much a two-for-one scenario," Horner said. "So due to the synergy projects, due to the integration of the drivetrain, then it's inconceivabl𒁏e to think that the two teams could operate on different power units.

"That introduces all kinds of comple💜xities particularly with IP etc, from the different suppl💞iers. So it will be way from ideal to have both teams on different power unit solutions."

AlphaTauri chief Franz Tost echoed Horner’s comments abou♕t sharing a supplier engine.

"We don't want ꦡto use a different power unit to what Red Bull Racing is using because we want to continue with the synergy process,"the Austrian explained.

"I don't want that we at AlphaTauri🌠 start once more designing our own gearbox, the complete rear suspension, that kind of stuff. We have a very close cooperation with Red Bull Tech𓆉nology, and we want to continue with them, and definitely want to have the same engine."

With Merc🦩edes ruling out a supply deal, and Ferrari ye𝕴t to consider a customer option with Red Bull, Renault appears the most likely current manufacturer to supply the Milton Keynes squad.

“Obviously Renault have to be considered as a potential supplier in the future,” Horner said on the prospect of a reunion with Renault. “I think Renault is a diffe💫rent organisation than the last time they supplied us.

"They have a new chairman who seems passionate about F1, which is good to see. And you know F1 needs that drive from the top of an organisation, that enthusiasm otherwise it's impossible to achieveဣ success in this sport."

Horner also indicated that Red Bull taking over Honda’s abandoned F1 engine in a continuation project with independen🔴t support could be a solution.

While Horner has✅ said that “all options” will be considered, he said Red Bull wants to have finalꦰised a succession plan by the end of the calendar year at the very latest.