
Wehrlein suffered a terrifying crash during the Race of Champions when he collided with Felipe Massa and flipped his three-wheeled Polaris Slingshot upside down.
The German walked away from the crash uninjured but was pulled from the rest of the event on medical advice.
Reports yesterday claimed an injury to his neck would keep him out of winter testing which starts in Barcelona on February 27.
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"Current rumours about Pascal Wehrlein in the media: the medical examinations are still ongoing," a Sauber statement said.
"Therefore, the reports are pure speculation.
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Pascal Wehrlein could miss crucial pre-season testing time with Sauber
"We will provide information in due time."
Wehrlein is on the Mercedes young driver programme but has signed a deal to drive for Sauber for the first time in 2017.
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Pascal Wehrlein's crash at the Race of Champions was spectacular – but he got away apparently fine
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Pascal Wehrlein, Tom Kristensen and Sebastian Vettel were all involved in the Race of Champions
He made his debut in F1 last year for the now-defunct Manor Racing, winning a solitary championship point at the Austrian Grand Prix.
But in spite of those results, Wehrlein emerged as an early favourite to replace Nico Rosberg when the Mercedes driver retired just five days after winning the F1 World Drivers' Championship.
However, team boss Toto Wolff decided against the 22-year-old and instead opted for the experience of Williams' Valtteri Bottas to fill the vacancy.
Instead, Wehrlein replaces Brazilian Felipe Nasr after his sponsor Banco do Brasil withdrew their funding.
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