Sergey Sirotkin has dismissed suggestions that Simona de Silvestro is a major threat to a 2015 drive at Sauber.
Russian Sirotkin joined the Hinwil-based squad in 2013 as part of a major sponsorship deal and the team were expected to groom him this year before promoting him to a race seat in 2015.
However, the team have in recent months also signed up De Silvestro as an affiliated driver and the former IndyCar racer has already done some F1 testing.
De Silvestro has admitted that she is hoping to earn a race seat in 2015, but Sirotkin insists she is not a rival.
"At Sauber, we have a third driver, Guido van der Garde, a test driver - that's me - and a sponsored racer, the person whom...
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