Former Williams driver Nico Rosberg was joined by seven-time World Champion Michael Schumacher for the team's maiden racing season. Mercedes has Nick Heidfeld as the test and reserve driver. In August, Mercedes released Heidfeld from his contract to allow him to do tyre testing. He will test the new Pirelli tyre that will be used in the season. In September, Heidfeld was signed by Sauber to replace Pedro de la Rosa.