Romain Grosjean says Lotus will run a thorough investigation into the cause of his dramatic crash in the Russian Grand Prix which wrecked his chance of a strong result.

The Frenchman, who is set to leave the Enstone-based team at the end of the season for Haas F1, was running strongly in the points over the opening laps at Sochi but lost control of his Lotus through the long left-hander turn three and slid into the crash barriers.

After coming to a rest on the edge of the track, Grosjean safely stepped out of his badly damaged car claiming he is feeling okay and will take part in the team's investigation on the smash.

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"I lost the rear end in a very high speed corner going through turn three and couldn't recover it. We don't know exactly why yet," Grosjean said. "We need to check what has happened - was it a driver error or something technical? - we'll see.

"I feel sorry for the guys because there will be a lot of work to repair the car. I feel okay physically and I'll certainly be a bit sore on Monday morning, but I'll be completely fine again after a couple of days."

Despite his bumps and bruises Grosjean says the missed opportunity of another solid points finish will have a longer-lasting effect after Force India pulled out a useful lead on his team in the constructors' championship thanks to Sergio Perez's first rostrum since Bahrain last year.

"We lost some good points today but let's understand what happened and look forward to the next race," he added.