Jadeveon Clowney out four to six weeks after knee surgery

Texans rookie linebacker Jadeveon Clowney, the No. 1 overall draft pick, had arthroscopic surgery on his right knee yesterday and will be out four to six weeks.

When asked if it is a torn meniscus, coach Bill O'Brien said he didn't know what was repaired in Clowney's knee.

Clowney left in the first half of Sunday's home win over the Redskins. He jumped to try to bat down a pass, and after he landed, he put his hand to his right knee and began limping. Some have speculated that his foot slipped between one of the 8-by-8-foot palettes of real grass that make up the Texans' field. ESPN reported Clowney told teammate D.J. Swearinger that he stepped in a hole.

"He didn't say anything to me about that," O'Brien said. "From looking at all the angles on film, he just came down awkwardly."

Cards rally, beat ChargersCarson Palmer threw a 13-yard touchdown pass to rookie John Brown with 2:25 remaining last night as the host Arizona Cardinals beat the San Diego Chargers, 18-17.

Brown caught a short pass and then eluded tacklers into the end zone, capping an 11-play, 91-yard drive. Arizona trailed 17-6 after three quarters, but Jerry Attaochu blocked a punt and forced a fumble, setting up 10 Chargers points.

Mathis' season likely over

Defending NFL sacks champion Robert Mathis of the Colts is expected to be out for the season after tearing an Achilles tendon during a private workout last week, a person with knowledge of the injury told The Associated Press.

In May, the NFL suspended Mathis for four games for violating its performance-enhancing substances policy.

Chiefs linebacker Derrick Johnson and defensive end Mike DeVito, a former Jet, will miss the rest of the season because of ruptured Achilles tendons.