Christian Klien
After an unsuccessful test for Force India in December 2007, Ralf Schumacher left Toyota to drive for Mücke Motorsport in the DTM series. 2007 GP2 champion Timo Glock, who had also been the test driver for BMW Sauber, returned to a Formula One race seat in place of Schumacher. Christian Klien, previously the test driver for Honda, and the Estonian driver Marko Asmer took up test driver roles at BMW Sauber.