Quarterback Brock Purdy popped up on the injury report this week after suffering a right shoulder problem during the team’s Week 11 loss to the Seattle Seahawks. More signs emerged on Thursday suggesting the injury could actually cause Purdy to miss time.

Purdy was at least a limited participant in Thursday’s practice, but did not take part in any of the throwing drills that were open to the media. Perhaps more tellingly, the 49ers pushed Purdy’s traditional weekly press conference back from Thursday to Friday, suggesting the organization genuinely is not sure who will start in Week 12 against the Green Bay Packers.

Despite the uncertainty, 49ers coach Kyle Shanahan said in his weekly appearance on KNBR that Purdy actually increased his workload relative to yesterday’s practice. The coach spoke as if Purdy is still the planned starter for Sunday.

Brandon Allen would be in line to start for the 49ers if Purdy cannot go.

The Niners have been very tight-lipped about the nature of Purdy’s issue. It only became public knowledge on Monday, a day after their loss to the Seahawks. Purdy went 21/28 for 159 yards, a touchdown and an interception in that game, and did not show any visible signs of injury.