The most significant injury to come out of Sunday’s 27-24 loss at Arizona was cornerback Kareem Jackson. He left the game and didn’t return. “Kareem has what they call a chest contusion,” defensive coordinator Wade Phillips said. Jackson also suffered an injury to his rib to go with a bruised sternum. Phillips didn’t sound optimistic that Jackson will be able to play in Sunday’s game against Oakland at Reliant Stadium. “There is an outside possibility, from what I’ve heard so far, that he could play,” Phillips said. “I’m assuming that he would play in two weeks (Jacksonville at Reliant Stadium), but again, we’ll see where he is as the week goes along.” Brice McCain, who’s the nickel cornerback, replaced Jackson in the lineup. Brandon Harris, a three-year veteran who’s a former second-round pick, became the third corner. Johnathan Joseph, the other starting cornerback, missed several plays during the Arizona game but returned.