Another week, another injury for Ben Roethlisberger. Roethlisberger's right thumb injury "is pretty painful," he said Thursday, but the Pittsburgh Steelers quarterback is hopeful it won't severely affect his throwing in Sunday's key AFC North game against the Cincinnati Bengals. The injury, not disclosed until Wednesday, follows injuries to both knees that kept Roethlisberger out of four games. Coach Bill Cowher also said Roethlisberger "tweaked" his ankle during a 26-7 loss to Indianapolis on Monday night, but that injury was not listed on the team's first injury report of the week. That report, issued late Wednesday afternoon, was the first disclosure of any thumb injury. Neither Roethlisberger nor Cowher mentioned it following the Colts' game.