Red Bull team principal Christian Horner says there are "caveats" and hurdles to overcome before a much-discussed Formula One partnership with Porsche is potentially agreed.
Recent media reports have indicated that the Volkswagen-owned marque plans to go beyond a joint engine programme by taking a 50 per cent stake in Red Bull Technology, the company which builds the team's cars.
Speaking after first practice ahead of Sunday's Hungarian GP, Horner told Sky Sports F1 that there was obviously plenty of speculation flying around.
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"I think I have said numerous times that we are engaged in constructive discussion with Porsche," he said.
"Porsche to come into F1 would be a really positive thing but there are so many caveats to that. There are the regulations to sort out, we're only at the very beginning of a process where discussions can begin.
"The first actual hurdle for any new manufacturer coming in is those technical regulations for the power unit from 2026 onwards."
Porsche and Audi, another Volkswagen brand looking to enter Formula One and linked to Swiss-based Sauber who run the Alfa Romeo team, have both said they cannot proceed until the rules are confirmed.
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That could happen in August, when the sport has its mid-season break.
Horner said Red Bull, currently leading both Formula One championships by a comfortable margin with Max Verstappen heading for a second successive drivers' title, were strong and in a great position.
"Red Bull powertrains is going from strength to strength. We've recruited some more great talent, some more announcements coming out soon and there's some significant recruitments into the team," he added.
"For us, we're on a journey. Where that takes us in the future if we decide to take on a partner only time will tell.
"But I think we're in great shape and looking forward to seeing exactly what these new regulations say on a sporting, a technical and most importantly financial basis."
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Red Bull have formed their own powertrain company at their Milton Keynes factory, hiring some key engine experts from rivals Mercedes. They and sister team AlphaTauri use engines with Honda technology at present.
Watch the Hungarian Grand Prix live on Sky Sports this weekend, with the race starting at 2pm on Sunday.