Vernon Davis referred to the concussion he sustained in Sunday's loss to the Panthers as "mild." Davis was allowed to ride the exercise bike and lift weights on Tuesday. He also said his memory and balance felt fine, surefire signs that the concussion isn't overly serious. The only concern is that Davis sustained a concussion in Week 16 last year. Still, he appears on track to suit up for this week's showdown with the Saints. We'll know more after Wednesday's practice.