The star was airlifted to hospital with a head injury following the accident on Thursday, although his publicist Connie Filipello said he only suffered “superficial cuts and bruises”.
But another driver who was behind the 49-year-old singer’s vehicle has told The Sun she saw him lying on the road surface smeared with blood.
Katherine Fox, 23, said he was wearing a ripped tracksuit and his trainers had come off when she saw him. She stopped her mini to provide protection by preventing other cars from hitting him.
Fox said she had been told the former Wham! star had tried to adjust his door because it was not properly closed and had fallen out.
Describing his appearance she told the paper: “There was a nasty cut on his forehead and the back of his head. There was blood all down his face and on his teeth.
“He was breathing and conscious but in shock.”
The singer was close to death only 18 months ago after being struck down with pneumonia in Vienna, but he fought back to perform again.
His accident took place near junction 6a, close to where the motorway meets the M25.
Michael, whose hits include Faith and Freedom, was treated at the scene and then taken to hospital by air ambulance.
Last week’s accident was the latest car drama for the troubled singer.
In Sept 2010 Michael received an eight-week prison sentence following an incident the previous July in which he crashed his Range Rover into a shop in north London. He was also given a five-year driving ban after he pleaded guilty to driving under the influence of drugs and possessing cannabis.
And he was banned from driving for two years and sentenced to 100 hours community service in 2006 when he was convicted of driving while unfit through drugs after he was found collapsed in his Mercedes.