Renault has called up German Formula One driver Nick Heidfeld as a possible replacement for injured Robert Kubica.
Heidfeld, who last raced with Sauber in 2010, will join Russian Vitaly Petrov and Brazilian Bruno Senna at the second pre-season test in Spain, this week.
Poland's Kubica is in hospital in Italy after suffering serious arm, leg and hand injuries while competing in a rally near Genoa earlier this week.
He'll be out for several months and could miss the entire season.
Senna, nephew of the late triple champion Ayrton, is the official reserve driver but lacks the veteran Heidfeld's experience.
