Coach Andy Reid isn't sure whether Jeff Garcia or Michael Vick would be the backup quarterback in that scenario. Vick is eligible to play for the first time after serving a two-game suspension as the final league penalty for his role in running a dogfighting ring.
"Is he 100 percent back and ready to play a whole game? I can't tell you that, I don't think so, and I don't plan on putting him in that position right now," Reid said.
McNabb missed Sunday's 48-22 loss to New Orleans with a cracked rib. Kolb made his first NFL start, throwing for 391 yards, two touchdowns and three interceptions. Garcia, signed last week as insurance, was the backup.
McNabb was injured in the season opener at Carolina. He didn't practice last week and was ruled out 90 minutes before kickoff.
"I feel pretty good, better than last Monday," McNabb said. "It's one day at a time. I think there is a process that is going on, and the progression makes you feel confident that things are going to be better. Hopefully, it will be quicker than later. I'm looking forward to being back out on the field."