Nick Heidfeld is yet to find a drive for the 2011 season © Getty Images Enlarge Related Links Drivers:

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Mercedes

Nick Heidfeld could be on his way out of Formula One after Mercedes revealed they were talking to potential candidates about their reserve driver role.

Heidfeld started last season with the German team as test driver before joining Sauber in September to replace Pedro de la Rosa for the final five races of the season.

But with Sauber naming Kamui Kobayashi and Sergio Perez as their driver line-up for 2011, Heidfeld's future in F1 remains in doubt once again.

Head of marketing Joachim Schmidt admitted they were not looking to appoint a German test driver - with Nico Rosberg and Michael Schumacher already confirmed as their line-up for the new season.

"We already have two German drivers," Schmidt told the Bietigheimer Zeitung newspaper. "At the moment we are in conversation with potential candidates."