On Wednesday, Scott McKillop landed awkwardly after jumping for a ball and had to be taken off the field by a cart. The early diagnosis is left knee sprain.
McKillop joins a list of players that were not participating in the afternoon practice due to injury.
The list of injured 49ers: Chilo Rachal (dehydration), guard David Baas (concussion), center Eric Heitmann (stinger), tackle Chris Patrick (shoulder sprain) and tight end Walker (concussion).