Walker had surgery on his ailing right knee earlier today, the same knee that he had surgery on in 2005 when he tore his ACL.
"The doctors don't think it's very serious, but serious enough to go in there and clean it out," Broncos coach Mike Shanahan said. "He's been off it for a few weeks and it hasn't got much better."
Walker had already missed two games with the injury. He returned to practice Monday, Denver's first after its bye week. Shanahan said Walker practiced at full speed and thought he would be ready to play Sunday against Pittsburgh.
But Walker was limited in practice on Wednesday. He traveled to Houston on Thursday to have the surgery.
"He's been kind of hobbling around the last few weeks," receiver Brandon Stokley said. "He gave it a go and you could tell something just wasn't right."
Walker had 230 yards in his first three games, including two 100-yard games to start the season.
--WR Brandon Stokley will continue to start in Javon Walker's spot. Walker will miss a few weeks with a knee injury. Stokley is most comfortable in the slot, and will move there in three receiver sets. In two starts Stokley has three catches for 34 yards.
--WR Glenn Martinez will continue to be a big part of the offense with Javon Walker out. Martinez has been the third receiver, and had six catches for 70 yards against San Diego.
--QB Jay Cutler's numbers will take a hit as long as Javon Walker is out with a knee injury. Cutler's two biggest games of the season were in the first two weeks when Walker was healthy. In the last two games with Walker out of the lineup he has 363 yards.
--CB Champ Bailey was uncertain if he could play against Pittsburgh after missing another practice with a quadriceps injury. The Broncos hope he can practice by Friday and play against Pittsburgh.
--WR Rod Smith hasn't practiced yet, although he is eligible to come off the physically unable to perform list. He had offseason hip surgery and will need time to get into football shape. Broncos coach Mike Shanahan said he would have a better idea at midseason if Smith will be able to practice.
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