SANTA CLARA -- The quarterback situation for Monday's 49ers-Bears game became somewhat more clear Friday.
With Jay Cutler ruled out because of a concussion, Jason Campbell will start at quarterback for Chicago. Meanwhile, Alex Smith's recovery from his own Sunday concussion appeared to keep him on course to play Monday night.
Smith practiced in a noncontact capacity for a third consecutive day after receiving clearance from an independent neurologist. Smith is progressing well, coach Jim Harbaugh said, and doctors will monitor him further this week before potentially clearing him to play.
"It's in the doctor's hands," Harbaugh said.
Opposing the former Raiders quarterback Campbell will be a familiar cornerback: Carlos Rogers.
Campbell and Rogers went to Auburn University together and were teammates for their first five NFL seasons with the Washington Redskins, who made them 2005 first-round draft picks.
That longtime kinship resulted in phone calls this week between Campbell and Rogers, the latter of whom noted: "Of course I joked with him and said, 'Don't be scared when you see us out there.' "
Whereas Campbell was traded to the Raiders before the 2010 season, Rogers didn't break free from Washington until last year, when he signed with the 49ers and earned his first Pro Bowl berth.
Campbell signed a one-year deal this past offseason to be Cutler's backup, a role that pressed Campbell into service Sunday night during the Bears' 13-6 loss to the Houston Texans. He completed 11 of 19 passes for 94 yards, including a 45-yarder to Brandon Marshall.
It will be Campbell's first start since he broke his collarbone last season in the Raiders' Oct. 16 win over Cleveland.
"It feels good to have an opportunity to get back in there and play," Campbell told Chicago reporters Friday.
Said Rogers of facing Campbell: "If he sees me one-on-one, I know he's coming at me, and I'm looking forward to the challenge."
The Bears signed veteran Josh McCown this week, giving them a backup behind Campbell.
Smith is seeking his first sack of the season but leads the 49ers with 34 quarterback hits and 51 pressures.
No fine was issued to Rams linebacker Jo-Lonn Dunbar for an inadvertent helmet-to-helmet hit on Alex Smith in the first quarter at the start of a series in which Smith suffered a concussion. Although 49ers safety Dashon Goldson drew an unsportsmanlike-conduct penalty for removing his helmet, he wasn't fined for it.