The 56-year-old star says he cannot think of a single actor who is better than his "Ocean's Eleven" co-star, reports Entertainment Tonight.
"Matt's the greatest actor I've ever worked with. In fact, I don't know a better actor I've seen in my life. I'm trying to think if there's a better actor. Nope, there's not a better actor. No, there is not," says Clooney.
Damon stars in Clooney's directorial venture "Subunicorn".
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