 In February 2014, IndyCar Series driver Simona de Silvestro was signed by Sauber as an "affiliated driver", with the intent of racing in F1 by .However, by the end of 2014, de Silvestro was no longer part of the team.For the season, Gutiérrez was retained and joined by Adrian Sutil, following Hülkenberg's decision to return to Force India.