Franks was held out of Thursday's practice, the first of the extended week for the Packers as they prepare for Monday night's game at Baltimore.
The three-time Pro Bowler is questionable to play because of neck and back injuries that Franks aggravated in the Dec. 4 loss at Chicago. He missed the overtime win over Detroit last Sunday.
"I'm just waiting for them to clear me," Franks said after practice. "If I'm cleared, I'll be out there (Monday). I'm not going out there until I'm cleared. So right now, (it's) day-to-day."
Franks said he still has soreness in both the neck and back.
David Martin would replace Franks in the starting lineup.
-- Center Mike Flanagan didn't practice Thursday. Coach Mike Sherman intended to give the starter more rest during the week.
Flanagan endured pain in the last game, stemming from the Oct. 5 surgery he underwent for a sports hernia. Flanagan has started the past seven games.
He's probable for Monday's game.
-- QB Brett Favre was kept out of practice for rest purposes. Since the team had a walkthrough session the previous day, the Thursday practice was akin to the Wednesday workouts from which Favre has been excused in recent weeks.
He's expected to make his 239th straight start Monday, although his 87-year-old grandmother, Izella French, is hospitalized in Mississippi after suffering a stroke Tuesday.