Red Bull have said that their hopes of securing a Mercedes engine supply in 2016 are now over.
Red Bull motorsport boss Helmut Marko told Germany's Bild newspaper: "The idea of Mercedes is finished. We are now focusing elsewhere."
Team principal Christian Horner said he was doing "necessary due diligence" in talking to other manufacturers.
With their partnership with Renault disintegrating, the team may be forced to switch to Ferrari engines.
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