Nick Heidfeld joins Sauber for the rest of the 2011 Formula One season . Heidfeld replaces Pedro de la Rosa , who is 'surprised ' by the decision . Comment:
Nick Heidfeld joins Sauber for the rest of the 2011 Formula One season . Heidfeld replaces Pedro de la Rosa , who is 'surprised ' by the decision . Heidfeld began season as test driver for Mercedes before joining Pirelli .