The 42-year-old 'Argo' star said many times casinos have asked him to leave as they don't allow playing blackjack, reported New York Daily News.
"That is a true story. I took some time to learn the game and became a decent blackjack player. And once I became decent, the casinos asked me not to play blackjack," he said.
Affleck, however, said there was no ill-feeling between himself and the casinos.
"There were a number of casinos that said, 'Hey, you can't play blackjack here. We know you count cards. But, you know, you're welcome to come, do whatever you want, see a show, have dinner. We'll comp ya. Play roulette, we know you don't play craps, but hang out, we still want your presence and business,'" the actor said.