Allan McNish was forced to retire from the Le Mans 24 Hours Race after crashing out at about 190mph just two hours into the event.
The Scotsman was lying second when his Audi UK car skidded on oil left by a slower car and hit the tyre barrier in an impact that knocked him unconscious.
JJ Lehto, driving a Champion Audi, also crashed but escaped with minor damage.
Doctors told McNish not to continue but the car was repaired and co-drivers Frank Biela and Pierre Kaffer resumed.
"Basically, coming into the Porsche Curves I saw, just as I started to brake, a puff of smoke which I thought was a tyre exploding," said McNish.
But as soon as I started to brake I lost grip. I turned into the corner and was just sliding and I knew it was oil.
"At that point I was going off the circuit so I was trying to go into the tyre wall at the best angle possible.
"It was quite a heavy impact because it's fifth gear with very little braking deceleration, which meant we were going into it at quite some speed."
He added: "For my safety and also other people's safety they advised that it was not
appropriate to continue this weekend, which is obviously disappointing considering the car is back out.
"But when a doctor tells you, they are the experts. I'm a little bit aching, headache etc... but nothing that I wouldn't have expected."