Mercedes non-executive chairman Niki Lauda admits team principal Ross Brawn's future remains undecided.
The Brackley squad's decision to sign Paddy Lowe has led to growing speculation that Brawn could decide to quit at the end of the season with former McLaren man Lowe set to take over as team principal.
Brawn made it clear at the Japanese Grand Prix that he could leave the squad if they don't back him, telling Sky Sports F1: "I think we need a very clear definition of who is in charge and obviously I need the motivation to carry on."
Lauda, though, maintains that everyone at Mercedes wants Brawn to stay on as number one for at least another season, but it is up to man himself to decide.
"It's down to him now, I'd say it's 50-50," Lauda told the Mirror.
"We have had some small problems in the team in the past but everything is sorted now. It's all agreed between him and Paddy and everyone else. He's No 1. I have tried to persuade him to stay. I want him to stay. We will talk again at the end of the season."