Carlos Sainz says he is unhurt after a high-speed shunt in third free practice for the Russian Grand Prix at the Sochi Autodrom hospitalised him.

The rookie suffered an off coming into turn 13 - which is preceded by one of the fastest points on the circuit -, with his Toro Rosso coming to rest deep into the softer Tec-Pro barriers nose-first.

Though it remains unclear what ultimately caused Sainz to go off, replays shown him losing the rear coming into the braking zone of the turn 13 90-degree right-hander, striking the near-side barrier, before spearing straight on without appearing to scrub much of the speed off.

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Occurring with 25mins of FP3 remaining, the session was immediately red flagged, with cranes being required to lift the barriers - which had been shifted over the front-section of the Toro Rosso by the impact - and allow medical teams to tend to him.

After almost 20mins in the stricken car, Sainz was eventually extricated and stretchered into the ambulance, before being airlifted to hospital.

A statement from the team went on to confirm he is talking with medical teams from Sochi Hospital before the man himself tweeted that is unhurt and wanting to race.

"Following Carlos Sainz's accident during FP3 today in Sochi, the driver is perfectly conscious and was able to talk to the extrication team," read a team statement.

"Once out of the car he was taken to the circuit Medical Centre, where he underwent an initial assessment of his condition.

"He has now been taken by air ambulance to the Sochi Hospital 4.

"Carlos Sainz, who never lost consciousness, underwent a medical examination, including a full body scan. The scan showed that the driver has no injuries.

"However, he will be staying in the hospital overnight as a precautionary measure, which is the normal procedure in these circumstances.

"Investigations on the reasons for the accident will take place once the car is back in the team's garage."