Christian Horner says Red Bull Racing should be able to confirm its engine deal for the 2016 Formula 1 World Championship season 'within a week'.

After months of deliberation and negotiations with various suppliers, Red Bull looks destined to continue with Renault-based power units in 2016, but will do so without branding and be permitted to develop the engine itself.

As it stands, Red Bull is yet to officially acknowledge this to be the case, though Horner did hint at the Renault link when he said its plans wouldn't be affected by French manufacturer's continued indecision over whether to purchase the Lotus team.

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"We have got a signed contract," he said. "There has obviously been an awful lot of activity over the last few weeks. I am not at liberty to say what that activity is. But I am sure it will all come out in the wash. We have a contract for an engine, the details of which I hope to be able to announce within a week."

Horner's comments come after Red Bull advisor Helmut Marko suggested it hadn't quite sealed its deal, but the team principal is more confident.

"Obviously Helmut [Marko] is fully aware that we are not in a position to announce what our engine is, but the situation is clear that we have an agreement for next year. The unfortunate thing is, I'd like to be able to tell you want it is, but today I can't.

Sister team Toro Rosso is expected to replace its Renault power units with Ferrari engines in 2016