Orton, who sprained his right ankle last Sunday against the Detroit Lions, was doubtful on the official injury report after working out Friday only during individual passing drills.
"I can't go that far," Bears coach Lovie Smith said when asked if Orton's first practice meant he could start Sunday. "He's making progress. This is the first day where he's actually able to do anything, so making progress. Beyond that I don't know."
Cornerback Charles Tillman practiced on a limited basis Friday due to a shoulder injury and is questionable for the game.
Copyright 2008 by The Associated Press