McCown suffered a possible broken index finger on his right (throwing) hand on the final play of the Raiders' season-opening 36-21 loss to Detroit. He also suffered a sprained right foot in the game, which is why he was held out of Wednesday's workout.
McCown wore a black glove on his right hand and threw passes before and after practice but did not take part in any team drills. He is listed as day-to-day.
Kiffin, who played cloak-and-dagger secrecy with the media last week regarding the quarterback situation, wouldn't say who would be the Raiders' starter against the Broncos but several players indicated it would be Culpepper.
Culpepper, as has been his custom, declined to speak with reporters following the practice while McCown held court for more than 20 minutes amongst a sea of television cameras and tape recorders. He sounded hopeful of playing against Denver but said that while CT and MRI scans showed a possible break at the end of his finger, the foot injury is what is bothering him most.
"That's more of a concern," McCown said. "I guess I sprained the top of my foot at some point in the game. It's actually very sore."