"He's a good card player," Damon told PEOPLE while attending the Planes of Fame Air Show in Chico, Calif., on Saturday.
Damon, who played a high-stakes poker player in the 1998 film Rounders, briefly addressed the gambling controversy surrounding Affleck's ban from blackjack.
Asked how good of a player his longtime friend is and whether the notion of his ban is believable, Damon replied, "Yeah, he can play."
So has Damon, who attended the air show with his wife, Luciana, and daughters Alexia, Isabella, Gia and Stella, ever used tricks from his Rounders role in the casino?
"Plenty of times," he said with a laugh.
Reporting by REAGAN ALEXANDER