Red Bull insists its deal to run unbranded Renault power units is not at risk even if the French car manufacturer decides to pull out of Formula 1.
Following a weekend of intense talks between Renault representatives and Bernie Ecclestone to try to resolve remaining differences over a commercial rights package, a decision on the company's future in F1 is expected within the next 48 hours.
If Renault CEO Carlos Ghosn is satisfied with the package that has been put together, then he will green-light a takeover of the Lotus outfit to resurrect a works outfit.
If, however, he believes the programme does not make sense for his company, then he could order it to shut down its F1 project altogether.
Contract in place
While Renault quitting could potentially have an impact on Red Bull's engine programme, team boss Christian Horner is adamant that the two elements are not linked.
"We have a contract for an engine, the details of which I hope to be able to announce within a week," said Horner.
When asked by Motorsport.com about if a Renault withdrawal could open up the danger of his engine deal being pulled too, he said: "We have got a signed contract.
"There has obviously been an awful lot of activity over the past weeks. I am not at liberty to say what that activity is, but it will all come out in the wash."
He added: "We are not in a position to announce what our engine is, but the situation is clear: we have an agreement for next year. The unfortunate thing is that I would like to be able to tell you what that is, but unfortunately, today I cannot."
Although Red Bull's decision to pursue the Renault path – after failed attempts to get deals with Mercedes, Ferrari and Honda – has come late, Horner is hopeful that its 2016 chassis design has not been compromised too much.
"We have designed four different variants of it," he said. "Inevitably that has put some delay into the process, but with next year being relatively static in rules, it is very much an evolution.
"For sure it has made the timescales much tighter, but the whole team in Milton Keynes has done a super job in working tremendously hard long hours and trying to get us back on to schedule."