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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.
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.
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.
Latest ITV News reports
Nico Rosberg has been crowned the new Formula One world champion, despite Lewis Hamilton winning the final race in Abu Dhabi.