Niki Lauda believes that the only engine option left for Red Bull in 2016 is Renault – and that the company's motorsport boss Helmut Marko regrets his public criticism of the French manufacturer.
Though Red Bull remains hopeful that it can still get a Honda deal, notwithstanding the veto from Ron Dennis, Lauda doesn't consider this a viable option, while the proposed low-cost standard unit being pushed by the FIA and Bernie Ecclestone will not be available until 2017 at the earliest.
“Next year, whatever the FIA does for a future engine, it will not be available,” said the Austrian.
“There is no [new] engine next year, the alternative. So what I would do if I'm Red Bull? I tell you.
"Ferrari said no engine, Mercedes can't because we have four teams already. There's only Renault left."
The three-time Formula 1 champion added: “If you ask Marko honestly, 'did you make too much negative talk in your relationship with Renault?'
"He also said to me, 'Yes.'
"All I'm trying to say is that the only alternative if Red Bull wants to continue, and I think they want to, is to find a way with Renault. It's clear.”