KANSAS CITY, Mo. -- Outside linebacker Justin Houston returned to Kansas City Chiefs practice on a limited basis but has yet to be cleared to play in Sunday's game against the Oakland Raiders at Arrowhead Stadium.
Houston was hit in the head/neck area last week against the Tennessee Titans. He remained in the game. He did not practice Wednesday.
The loss of Houston would be a major one for the Chiefs. Houston leads the Chiefs with 8.5 sacks.
If he doesn't play, Houston would be replaced by veteran Frank Zombo, a former starter with the Packers. Zombo had four sacks as a rookie in 2010.
Running back Jamaal Charles, who has blisters on his feet, also returned to practice on a limited basis after sitting out a day earlier.
Listed as full practice participants: tackle Eric Fisher (concussion), guard Jeff Allen (groin), tight end Sean McGrath (knee), fullback Anthony Sherman (knee), offensive lineman Geoff Schwartz (tricep) and linebacker Dezman Moses (toe).