The Cardinals could be facing a fourth consecutive game without starting quarterback Kevin Kolb, which only a week ago didn't seem like such a bad thing.
But John Skelton played poorly in Sunday's loss to the 49ers, ending speculation that a quarterback controversy was sprouting.
Skelton looked like the young player that he is. His passes were erratic all afternoon, and he admittedly made poor reads.
Kolb, meanwhile, continues to rehabilitate his injured right foot. He took part in individual drills last week but found he couldn't move well enough to play.
"I pushed it hard all week, and it just wasn't there," Kolb said. "I think I would have been hurting my team if I went out there and tried to play on it. I would have been limping around everywhere and definitely would not have been up to par."
Kolb's injury includes turf toe, sprained ligaments in the mid-foot and a bone bruise on the outside of the foot.
He is wearing a protective device in his shoe. With that and a tape job, his risk of aggravating the injury isn't great. However, Kolb is having a hard time running and planting to throw.
"I'm going to push it as hard as it can go and try to be out there," Kolb said.
If Kolb can't play, Skelton would start a fourth consecutive game Sunday at St. Louis, coach Ken Whisenhunt said.
Skelton led the Cardinals to two consecutive victories, overcoming slow starts to play well in the second half. He couldn't do that against the 49ers. He completed six of 19 passes for 99 yards and had three passes intercepted.
He was replaced by Rich Bartel in the fourth quarter.
"John didn't play his best, but he's got to bounce back," Whisenhunt said. "If he has to play this week, he's got to be ready to go."