SANTA CLARA The final step an NFL player must take to be cleared following a concussion is a "contact test," which for left tackle Joe Staley involved banging helmets with two other offensive linemen for a minute or two.
"Then they see how you feel," said Staley, who suffered concussions in each of the past two seasons but played the following week both times.
Alex Smith has yet to go through his contact test, although that process likely is different for a quarterback than for an offensive lineman.
Smith has passed all of the post-concussion steps but the last, which likely will be administered today. He has practiced in a no-contact, black jersey the last four days, including Saturday.
The 49ers list him as questionable on the injury report. That designation means there's a 50-50 chance he'll be available Monday against Chicago. However, the way the 49ers have allocated snaps in practice this week suggests they believe Smith's chances are better than that.
Asked if Smith's number of practice snaps were the same as in previous weeks, offensive coordinator Greg Roman said, "Thereabouts."
"Not quite as much for Alex," Roman said. "But I think he's gotten plenty of practice time."
Injuries Cornerback Chris Culliver, who is dealing with a shoulder injury, is listed as probable with nine other 49ers.
They are running back Anthony Dixon (hamstring), safety Dashon Goldson (ribs), linebacker Tavares Gooden (elbow, quadriceps), center Jonathan Goodwin (ankle), running back Frank Gore (ribs, wrist), guard Mike Iupati (quadriceps), wide receiver Mario Manningham (shoulder), defensive end Will Tukuafu (wrist) and linebacker Patrick Willis (shoulder).
For the Bears, quarterback Jay Cutler (concussion), defensive end Shea McClellin (concussion) and defensive tackle Matt Toeaina (calf) are out.
Rookie wide receiver Alshon Jeffery (hand) and defensive tackle Henry Melton (back) are probable.