According to reports, Clooney was thrown over the top of his scooter after the hit.
Local media representatives who gathered at the hospital said the Oscar-winning actor-director left in a van through a side exit.
Giovanni Mannoni, a police commander in Olbia, said the actor did not suffer any serious injuries or break any bones. The driver, probably horrified to find out Clooney was the one on the scooter, stayed with the actor until an ambulance rushed him to the nearby John Paul II hospital.
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According to local reports, Clooney was thrown off his scooter after colliding with a auto that failed to "respect the right of way". "He is recovering at home and will be fine". In the show, Clooney stars as Colonel Cathcart. He is a frequent visitor to the Venice film festival and Wednesday his wife Amal in the city in 2014.
A police investigation is now underway, to determine the cause of the accident, and more details are bound to emerge in the coming hours.
Clooney was riding his motorized scooter to set Tuesday morning when he was struck by a auto.
George's reps told Metro.co.uk: 'George Clooney was treated and released from an Olbia hospital.
George and Amal Clooney.