McNabb fractured a rib on a touchdown run late in the Eagles' 38-10 win over Carolina last Sunday. He was on the practice field for the team's walkthrough Thursday morning, but did not partake in it.
If McNabb does not play Sunday, third-year quarterback /*Kevin Kolb*/ would make his first NFL start. Kolb was the team's second-round draft pick in 2007.
Veteran quarterback /*Jeff Garcia*/, signed Tuesday, would be the back up.