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London - Sebastian Vettel's former boss thinks the German driver may soon run out of patience with Ferrari.
Christian Horner, who oversaw Vettel's four consecutive world championships for Red Bull, told Sport Bild that he senses a lack of calm in the 29-year-old's current disposition.
Vettel and Mercedes?
Red Bull team boss Horner told the German newspaper: "I have the feeling that Seb (Vettel) is a bit rattled."
READ: British GP - 9th-place Vettel slams Ferrari's pace
Horner added: "I know from personal experience that he has to feel good in order to perform well. And I'm not sure whether he likes (Ferrari president) Sergio Marchionne's pressure.
"I can well imagine that in 2018 Seb will switch to Mercedes if he doesn't start making progress with Ferrari."
'Vettel is a leader'
The Italian press is currently characterising Ferrari as being in 'crisis', having failed to capitalise on its progress and being out-performed in recent races by Red Bull.
But Gerhard Berger does not agree with Horner that Vettel is becoming rattled by the pressure.
"I know him from the Red Bull days," the former Toro Rosso co-owner told Italian newspaper Corriere della Sera, "and he is a true leader. He never loses heart."
READ: Vettel - 'I want to be a world champion with Ferrari'