Ross Brawn would not be drawn on speculation about Mercedes's 2013 line-up, saying the decision is still "some way off."
Earlier this week rumours emerged claiming that Lewis Hamilton is heading to Mercedes next season replacing the retiring Michael Schumacher.
All parties, though, have been quick to deny the story.
"We don't comment on speculation, I'm afraid," Brawn said. "So when we make our driver decision, then you'll be the first to hear about it. But it's still some way off.
"Coming to a conclusion on our driver situation will take some time still and when we're there we'll be very happy to share it with you. But we've still got some way to go."
As for claims that Schumacher is on his way out of Formula One, Brawn insisted Mercedes are still in talks with the seven-time World Champion.
"We're discussing things with Michael and there's no panic in those discussions. That's what we're focussed on at the moment.
"I don't think it's his (decision) alone, we've got to find a solution together.
"I can't honestly go into details, but it's not Michael's decision to stay, it's not our decision for him to stay, it's a joint decision.
"It could be tomorrow, it could be a month. We've got a lot of things we're discussing with him, and when we reach a conclusion, we'll be happy to share it with you. I can't set a timescale, I'm afraid."
Pressed as to whether he was keen for the 43-year-old to remain with Mercedes, the team boss said: "I think Michael has a huge amount to offer.
"We saw his driving in Spa - a great performance in Spa that we didn't back up with as strong a car as we'd want. And he's had lots of performances like that this year.
"I'm very happy with Michael's performance. With these technical challenges that we're going to face particularly in 2014 someone of Michael's experience and calibre would be great asset to any team, but particularly our team."
As for his thoughts on Hamilton, Brawn would not be drawn other than to say he is "a very good driver, an excellent driver."