Formula One great Niki Lauda has called for Red Bull to "find a way with Renault" amid uncertainty over the team's Formula One future.
Niki Lauda has urged Red Bull to resolve its differences with engine supplier Renault and envisages a "big problem" for Formula One if they are unable to reconcile.
Red Bull enjoyed a period of dominance in the sport as they won the constructors' championship between 2010 and 2013 and Sebastian Vettel took the drivers' title four years in a row.
Changes in F1's regulations have hit Red Bull hard though, with Renault unable to match the power of Mercedes " who have dominated the past two years.
Red Bull co-founder Dietrich Mateschitz has threatened to quit F1 if the team are not supplied with a competitive engine for next season, with their Renault relationship seemingly beyond repair.
But Red Bull's options are limited given the lack of an alternative supply option from Mercedes, Ferrari or Honda and Mercedes non-executive chairman Lauda believes they should get their heads together and repair relations with Renault.
"Next year, no matter what the FIA does for future engines, it will not be available," Mercedes non-executive chairman Lauda is quoted as saying by Autosport.
"So what would I do if I am Red Bull? I can tell you.
"Ferrari said no engine, Mercedes can't because we are four teams already so there is only Renault left.
"If you ask [Red Bull motorsport advisor Helmut] Marko honestly, 'Did you do too much negative talk in your relationship with Renault?' He always will say to me 'yes'.
"If Red Bull want to continue and I think they want to, then find a way with Renault. If they don't continue, we have a big problem, not only for Red Bull."