George Clooney has said he was waiting for the "switch to turn off" after his motorcycle accident last year.

The 58-year-old Hollywood star was taken to hospital last July after he collided with a car in Sardinia, where he was shooting his TV adaptation of Catch-22.

He told The Hollywood Reporter: "It was bad. I hit him at 70mph or so. Split my helmet in half."

"It knocked me out of my shoes," he added. "It hit hard."

Clooney went on: "I was just waiting for the switch to turn off because I broke his windshield with my head and I thought, OK, well that's my neck."

The actor was back at work four days after the collision. But he said he has now sworn off motorcycles.

"If you get nine lives, I got all of them used up in one," he said. "So I can let go of motorcycle riding for a while."