CCTV footage showed the actor, 57, being flung into the air after a front-on collision with a Mercedes being driven by plumber Antonello Viglino.
The actor was driving from his home in Puntaldia to a film set in Olbia, on the north-east coast, when the grandfather veered into oncoming traffic.
Clooney's helmet shattered as he smashed against the car's windshield at around 60mph and flipped over the handlebars before crashing to the ground.
Miglino, 65, has now told of how the Oscar winner's bodyguards told him: "You hit Clooney!"
"Clooney, the actor, the one who shoots the film at the airport?" replied Miglino who was apparently trying to turn into a residential compound.
"I didn't see anything, I had the sun on my eyes. I was about to turn, I just got over the line."
The elderly man slumped onto a nearby wall in shock when reality slowly set in, MailOnline reported.
He apparently asked if he could visit the Ocean's 11 star at John Paul II hospital but an ambulance had already taken him away.
Clooney's spokesman Stan Rosenfield has since said: "He is recovering at his home and will be fine."
The Hollywood heartthrob was found lying in the road with injuries to his pelvis and bruising to his knee and arm.
Images from State Road 125 showed slight damage to his bike while the left side of the car windscreen was badly smashed.
Witness Gianni Visciano said Clooney was screaming when his bodyguards removed his battered helmet.
He went on to say the actor could not move his head or legs in the aftermath of the crash.
Viglino called an ambulance and waited with father-of-two Clooney until medics arrived to take him to hospital.
A police spokesman said: ''The driver of the car was a local man in his 60s and we are speaking to him about what happened.
''It was fortunate the man on the motorbike was wearing a helmet as his head hit the windscreen which smashed.''
His wife Amal, 40, rushed to hospital to be at his side and he was discharged just two hours later.
The Oscar-winning actor-director left in a van through a side exit, local media reported.
Firefighters were dispatched to the scene of the accident as a safety precaution.
Clooney was pictured stepping off a private jet with wife Amal and twins, Alexander and Ella, in Sardinia at the end of last month.
Even earlier in June, Clooney was seen zipping around the island on a scooter with Amal, 40, hugging him tightly.
The A-list couple are believed to have brought their parents to the island to help care for the children while George works.
Clooney has been in Sardinia to direct, produce and star in Catch 22, a six-episode mini-series based on the novel by Joseph Heller.
In April, the legendary thespian announced he was cutting down his acting role in the Hulu production so he could focus on directing.
George and Amal met back in 2013 when Amal attended a party at the Ocean's Eleven star's house in Lake Como, Italy.
It was from that moment George made it his mission to land Amal, later taking her on their first date at a plush London restaurant.
She explained in an interview with Vogue: "I was 35 when I met him. It wasn’t obvious that it was going to happen for me. And I wasn’t willing or excited about the idea of getting married or having a family in the absence of that. "
But romance quickly blossomed between the pair, who married just over a year later in Venice, Italy.
They have since welcomed their adorable twins Ella and Alexander, each of whom have already said their first word.
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