ALAMEDA, Calif. -- The Raiders are keeping mum about Sio Moore's injury and are not saying if the second-year linebacker will require surgery in the offseason.

Moore was placed on season-ending injured reserve Tuesday after battling a hip injury for several weeks. Oakland's second-leading tackler, Moore did not play in last week's loss to Kansas City. He also missed two games earlier this season with an ankle injury.

Interim Raiders coach Tony Sparano, however, declined to discuss details about Moore's situation and would not confirm or deny if the linebacker was headed for surgery.

"That's not something were going to talk about right now," Sparano said. "He's on IR."

Several other players might not be far behind.

The Raiders' injury report is filling up faster than a water bucket in the Bay Area, with seven players unable to practice and two others limited during Wednesday's workout.

Defensive lineman C.J. Wilson is the latest to go down. Wilson injured his knee after recovering a fumble in the third quarter of last Sunday's loss to the Chiefs. He was tackled by Kansas City quarterback Alex Smith following a 21-yard return that led to a Sebastian Janikowski field goal for Oakland.

Wilson was among the seven who did not practice on Wednesday. The rest of the injury report is below.

Did not practice: CB Tarell Brown (foot), WR Vincent Brown (groin), CB Chimdi Chekwa (hamstring), TE Brian Leonhardt (concussion), WR Denarius Moore (knee/ankle), RT Menelik Watson (foot/ankle).

Limited: QB Derek Carr (right thumb), CB TJ Carrie (ankle).