(AP) — Kevin Kolb failed to practice again on Thursday, seemingly decreasing the likelihood the Arizona quarterback will be able to start when the Cardinals play at Philadelphia on Sunday.
He insisted, though, that there has been "dramatic improvement" in his right turf toe injury.
While John Skelton could be headed for his second straight start, coach Ken Whisenhunt raised the possibility that there could be a game-time decision to dress Kolb as the backup quarterback, even if he is unable to practice for the second week in a row.
"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 dearly wants to play against his former team. He started seven games for the Eagles over a four-year span and was the heir-apparent to Donovan McNabb before the arrival of Michael Vick.
Kolb started last season's opener for Philadelphia but left with a concussion and was replaced by Vick, who has been the Eagles' No. 1 quarterback since. Kolb got his wish to be traded to Arizona before this season started but the team has gone 1-6 with him at the controls.
Skelton was responsible for two safeties but led the Cardinals on an 84-yard game-tying touchdown drive in the fourth quarter, throwing 13 yards to Larry Fitzgerald for the score, in Arizona's 19-13 overtime victory over St. Louis last Sunday.
Kolb was injured early in the team's 30-27 overtime loss at Baltimore on Oct. 30 but stayed in the game to the finish. He has not been able to practice since then.
Kolb was upbeat on 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 could inevitably 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."