The Bears on Friday officially ruled quarterback Justin Fields out of Sunday night's road game against the Chargers with a dislocated right thumb.
Fields has been sidelined since exiting an Oct. 15 loss to the Vikings in the third quarter after sustaining the injury when he landed awkwardly while being sacked.
With Fields unable to play, undrafted rookie Tyson Bagent is set to make his second straight start. In his first NFL start last Sunday, the Division II product completed 21 of 29 passes for 162 yards with one touchdown, no turnovers and a 97.2 passer rating in a 30-12 win over the Raiders at Soldier Field.
Fields, meanwhile, continues to make progress in his recovery.
"We're happy with where he is," said coach Matt Eberflus. "He's working with the trainers still this week, and we'll give a better update on Monday."
The Bears on Friday also ruled right guard Nate Davis out of Sunday night's game due to an ankle injury he suffered versus Minnesota.
Eberflus revealed that left tackle Braxton Jones will miss his fifth straight contest with a neck injury he suffered in a Week 2 loss to the Buccaneers in Tampa. Jones returned to practice Monday, opening a 21-day window to put him back on the active roster, but he's not yet ready to play.
"He's going to be working through his window right now," Eberflus said. "We'll talk about that more next week. We don't know exactly where he is in terms of the movement and all those things, but [he's] with the trainer, he's working good."
Rookie right tackle Darnell Wright was not given an injury designation after practicing in full Friday. The first-round pick did not work out Wednesday and was limited Thursday with shoulder and toe injuries.
"He's working well," Eberflus said. "He did a nice job this week. He's got his strength back in that shoulder and obviously that's an injury where you've got some pain in there, so we'll see where it is, but he was really working well this week. We're pleased with where he is."
Elsewhere on the offensive line, Lucas Patrick (back) was added to the injury report Sunday morning and is listed as questionable.
Rookie running back Roschon Johnson also was not given an injury designation and is expected to return after missing the last two games with a concussion. The fourth-round pick practiced in full all week.
"We're certainly pleased that he's back," Eberflus said. "It's an exciting piece for us, not only for running back but also for special teams. He has a big role in that way too."
Jackson practiced in full Friday after being limited Wednesday and Thursday with an injury that has forced him to miss last Sunday's win over the Raiders.
"He's getting close," Eberflus said. "We've got some time [before the game], but he is trending in the [right] direction. Looked a lot better than he did last week, and we like where he is, too."
Brisker did not practice all week after getting sick Monday or Tuesday.
The Bears were back on the practice fields at Halas Hall Wednesday to continue their preparation for Sunday night's road game against the Los Angeles Chargers.