But Kolb insisted there has been "dramatic improvement" in his right turf toe injury.
"I wouldn't say that he has to (practice), but I would like for him to," Whisenhunt said. "It's all going to be a function of how much more he can do on his foot. He's made good progress, but we have to make sure that he can, like we said, still be able to drop and move."
Kolb was upbeat Thursday, though. He said he's moving better and is improving his ability to push on the injured foot, which he plants while passing.
"That's what we're seeing dramatic improvement in the last couple of days," he said.
While the decision inevitably could be to start Skelton, the question of whether Kolb is healthy enough to be the backup ahead of Rich Bartel might not be answered until Sunday.
"It could go to game-time to where he would be in a backup role," Whisenhunt said. "You could think of it that way. It's really going to depend on how comfortable he is with the plan and if he can do anything or not as we continue to build off of that as the week progresses."
Copyright 2011 by The Associated Press