Mercedes are considering Fernando Alonso as a replacement for retiring world champion Nico Rosberg.
But two-time championship winner Alonso is about to enter the final year of his three-year deal with McLaren, meaning Mercedes may have to look elsewhere.
"You have to consider Fernando," Mercedes boss Toto Wolff told Sky Sports' F1 Special: Nico The Brave show.
"He is a driver I respect a lot. He combines talent, speed and experience. It's all there.
"But he is in a contract with McLaren-Honda at the moment and we just need to weigh all the other options up."
Mercedes face a race against time to bring in a new driver alongside Lewis Hamilton, with pre-season testing due to begin in February.
Rosberg made his surprise announcement last week, just five days after sealing the drivers' championship.
New Formula One world champion Nico Rosberg has sensationally quit the sport with immediate effect.
The German driver, who races for Brackley-based Mercedes, has decided to call time on his career after achieving his dream of winning the world championship on Sunday.
Many people had been looking forward to seeing Rosberg renew his rivalry with Stevenage's Lewis Hamilton next season, but that now won't be the case.
Since 25 years in racing, it has been my dream, my ‘one thing’ to become Formula One World Champion.
Through the hard work, the pain, the sacrifices, this has been my target.And now I’ve made it. I have climbed my mountain, I am on the peak, so this feels right.
My strongest emotion right now is deep gratitude to everybody who supported me to make that dream happen.
It appears new Formula One world champion Nico Rosberg celebrated his title as you expect - by partying long into the night.
The German tweeted a picture of the lively post-season bash last night in which he quite understandably looked a little worse for wear!
Rosberg beat his Mercedes teammate Lewis Hamilton to the championship, despite Hamilton winning the final race in Abu Dhabi yesterday.
Nico Rosberg has been crowned the new Formula One world champion, despite Lewis Hamilton winning the final race in Abu Dhabi.Read the full story ›
Stevenage's Lewis Hamilton will start tomorrow's all-important Abu Dhabi Grand Prix on pole after a dominant display in qualifying.
The 31-year-old finished more than three tenths of a second ahead of his Mercedes teammate Rosberg who will join Hamilton on the front row.
Milton-Keynes Red Bull complete the top three, with Daniel Ricciardo lining up in third.
Despite Hamilton's performance, Rosberg remains the big favourite to win the world championship title tomorrow.
If the German finishes third or above he will be crowned champion, regardless of what Hamilton does.
Despite winning in Brazil yesterday, it's unlikely that Lewis Hamilton can retain his world championship, but is it still possible?Read the full story ›
Northamptonshire-based Force India have confirmed German driver Nico Hulkenberg will move to F1 rivals Renault next season.
The 29-year-old has been part of the team for the last five years, but has decided to end his contract in order to "explore fresh opportunities".
Force India will now have to find a replacement, with Manor Racing's Esteban Ocon and Pascal Wehrlein likely to be among the targets.
Everybody at Sahara Force India wishes Nico well as he embarks upon a different path in Formula One.
Having spent five years with us, Nico has become a great friend and contributed a huge amount to the team’s success.
He’s an outstanding driver, who has scored more points for this team than anybody else.
While it’s true we will miss Nico, we respect his decision to explore fresh opportunities and it would be wrong to stand in his way.
Stevenage driver Lewis Hamilton couldn't hide his anger with his Mercedes team after an engine failure denied him the chance to win the Malaysian Grand Prix.
Hamilton was cruising to victory before his engine blew up with just 15 laps remaining to hand the win to Red Bull's Daniel Ricciardo.
Nico Rosberg finished third to stretch his lead at the top of the drivers' championship to 23 points, and after the race a clearly agitated Hamilton appeared to accuse those in charge at Mercedes of favoritism.
"Someone doesn't want me to win this year," he told BBC Radio 5 Live.
"My question is to Mercedes. We have so many engines made for drivers, but mine are the only ones failing this year.
"Someone needs to give me some answers because this is not acceptable.
"We are fighting for the championship and only my engines are failing. It does not sit right with me."
Lewis Hamilton is facing an uphill struggle to regain his world championship title after picking up no points at the Malaysian Grand Prix.Read the full story ›
Stevenage driver Lewis Hamilton will start on pole for tomorrow's Malaysian Grand Prix.
The grid has a familiar look to it, with Hamilton's Mercedes teammate Nico Rosberg starting second and Max Verstappen from Milton Keynes-based Red Bull in third.
Hamilton secured a fastest lap of 1:32.850 to qualify fastest - four tenths of a second ahead of Rosberg.
It's the third successive year he's been on pole in Malaysia and a win tomorrow would close the gap on Rosberg in the Drivers' Championship who currently holds an eight point advantage.