Jeff Garcia, picked up by the Eagles on Tuesday, would be Kolb's backup. He will be the No. 3 emergency quarterback if McNabb starts.
McNabb cracked a single rib when several Panthers defenders crunched him on his 3-yard touchdown run in the third quarter of last week's win at Carolina. McNabb didn't immediately get up after the touchdown, and Eagles trainers attended to him before he eventually left the field on his own.
Reid said McNabb's ribs need to get "sticky" -- or, not move up and down -- before he should play.
Kolb has never started an NFL game or thrown a touchdown pass.
"This is his opportunity to present to the rest of the league what he's all about," Garcia said. "Hopefully he takes advantage of all of that."
Copyright 2009 by The Associated Press