Red Bull is flirting with a change of engine supplier, according to reports on Wednesday.
Dr Helmut Marko has told Germany's Sport Bild that the reigning world champion team will assess the progress made by current supplier Renault at the time of its home Austrian grand prix at the Red Bull Ring in June.
"We have to decide on our future engine partner then," he said.
A partnership with Mercedes has already been ruled out, and becoming a customer of another arch-rival, Ferrari, must also be seen as highly unlikely.
Honda is returning to F1 as McLaren's works partner next year, with Red Bull magnate Dietrich Mateschitz recently saying he did not want to simply be a...
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