Esteban Gutiérrez and Adrian Sutil were released from Sauber, where they were replaced by the former Caterham driver Marcus Ericsson and the GP2 driver Felipe Nasr [REF].
Manor Marussia also had two new drivers: They employed the former Caterham driver Will Stevens to drive for his first full season in the sport,[REF] while another former Caterham test driver, Roberto Merhi, was signed to a short-term deal while he also drove in the Formula Renault 3.5 Series [REF].