(Photo credit: David Gonzales-Imagn Images)
Brock Purdy participated in the start of Thursday's practice with the 49ers but the San Francisco starting quarterback was not on the field for the majority of the workout, casting doubt over his availability to play Sunday at Green Bay.
Purdy is dealing with a right shoulder injury and the 49ers are also potentially without left tackle Trent Williams and Nick Bosa due to injur
