Audi's Mike Rockenfeller will stay overnight in the hospital as a precaution following his massive shunt into the barriers after the Mulsanne straight.
Rockenfeller was able to crawl out of the car and behind the safety barrier immediately after the crash, which led to a two hour Safety Car period as marshals reconstructed the barrier at the point where the #1 Audi had made contact.
Audi has confirmed Rockenfeller's early diagnosis is positive, but he will be held overnight due to the severity of the impact.
His crash came hours after a similarly huge accident for Allan McNish in the sister No. 3 Audi R18, which was also caused by contact as McNish tried to come through traffic. The Scot was unhurt in the crash.
The sole remaining No. 2 Audi currently leads Le Mans at the halfway stage of the race.