Christian Horner insists Red Bull is still motivated by a desire to rediscover its race-winning form following its worst start to an F1 season since 2008.

With a best finish of just sixth place from the opening four events and ongoing concerns with reliability from the much maligned Renault power unit, Red Bull has found itself mired in the mid-field during the early events.

Nonetheless, Horner denies the dip in form is having an adverse effect on Red Bull, insisting the team remains motivated to ensure it can 'improve the bits it can control' at least.

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"We got our head down and we are focusing on improving the bits we can control, so morale is OK," he said. "People are frustrated, they got used to winning and having the taste of success, and it doesn't taste great when you are not winning. But that is an added motivation to get back there.

Indeed, Horner levels the problems back at Renault, insisting there would be more ill-feeling inside the team were it suffering with a fundamental chassis issue.

"It is not something we are in control of, if we had a chassis deficiency. You work away, make the bits, you put them on the car, you go quicker or slower. We are in the hands of our engine supplier and engines are a different world to chassis, so leap times are so much greater."

Red Bull's future in F1 has been brought into doubt in recent weeks following comments made by owner Dietrich Mateschitz that it could quit if it cannot rediscover its form.

Furthermore, Renault has intimated that it is seeking to purchase an existing entry to establish more of an independent, factory-assisted outfit, with Red Bull's B team Toro Rosso being targeted.