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."
Rex Grossman, who finished last Sunday's game, is the likely starter against Tennessee. Four players who missed all or part of last Sunday's game with Detroit went through a full practice Friday and were listed probable: safety Mike Brown (calf), linebacker Hunter Hillenmeyer (thumb), receiver Brandon Lloyd (knee) and defensive back Danieal Manning (hamstring).
Cornerback Charles Tillman practiced on a limited basis Friday due to a shoulder injury and is questionable for the game.
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