May 7 (GMM) Sebastian Vettel had a headache but no concussion after crashing heavily in Turkey on Friday.

The 23-year-old German sat out the second session at Istanbul Park whilst his Red Bull mechanics repaired significant damage to all four corners of the chassis he calls 'Kinky Kylie'.

But the fact that there was little activity in his garage as the afternoon session took place raised speculation the championship leader was not feeling well after the high-speed double impact on the exit of daunting Turn 8.

Finnish physio Tommi Parmakoski told Turun Sanomat newspaper that it was the biggest crash Vettel has had since he started working with the reigning champion.

Vettel visited the medical centre afterwards because the impact was measured at 5.7G.

"We suspected a concussion but fortunately it was nothing like that," Parmakoski said. "Sebastian is fine and had only a headache," he added.

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