Christian Horner has confirmed Red Bull Racing has put pen to paper on an engine deal that will ensure its place on the Formula 1 grid in 2016.

Having originally intended to drop Renault in favour of a 'more competitive' power unit for next season, the four-time title winning team was left in limbo when its preferred option of Mercedes and Ferrari engines was scuppered by both manufacturers' refusal to supply.

However, while Red Bull has stayed relatively coy on it future plans, recent partnership extensions - with three announced this week alone - and the fact it has submitted an entry for 2016 had pointed towards a new engine deal having been agreed.

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Horner has now confirmed to Sky Sports F1 that this is the case, though he is unwilling to divulge exact details.

"We've entered the world championship, we've signed a contract for an engine, but I can't tell you what it'll be or called at the moment," he said.

With no options from Mercedes and Ferrari, it is understood Red Bull will in part reconcile with current engine supplier Renault, but will take development of the power unit in house with assistance from Mario Illien.

As a result, the engine could run unbranded or under a different moniker to Renault, which is set to take over Lotus to return as a full constructor entry.

Red Bull has repeatedly expressed its frustration at Mercedes and Ferrari's refusal to supply its team, suggesting they are afraid of competition. With this in mind, owner Dietrich Mateschitz threatened too withdraw Red Bull from the championship.

Meanwhile, Red Bull's sister team Toro Rosso is expected to take on a Ferrari engine supply to replace its current Renault power units.