The San Francisco 49ers will not give away much information in the days leading up to each game this season, but Wednesday we might have gotten a little bit of confirmation of the cornerback depth chart. According to the beat writers, Tramaine Brock and Chris Culliver did not participate in practice. In their place, Perrish Cox and Dontae Johnson were working at the two outside cornerback positions. Jimmie Ward was in pads at the beginning of practice, and would seem set to continue his work as the nickel back.
Apparently Eric Reid mentioned that Chris Cook would be active for Sunday's game. Cook was reportedly working with the scout team, which indicates he is likely serving in a backup role, even if Brock and Culliver can't play. This is not breaking news, but it gives us a little bit more, so there's that.
Cook seemingly had a solid training camp, but Johnson moved past him on the depth chart. Johnson had a solid camp as well, and in his first game action was a big contributor against the Dallas Cowboys. If all had remained healthy, Johnson probably would have seen no more than special teams work, or maybe some mop-up duty. Instead, he moved into the starting lineup, and looked solid.
The 49ers face a Bears squad that should have Brandon Marshall playing, but we don't know if they will have Alshon Jeffery. It's a challenge either way, but an absent Jeffery changes things a fair amount.