The San Francisco 49ers have battled injuries to some of their best weapons this season, and that trend continued this week, with quarterback Brock Purdy nursing a shoulder issue ahead of Week 12. 49ers head coach Kyle Shanahan announced Friday that Brandon Allen will start in place of Purdy for Sunday's game against the Packers.

The San Francisco 49ers’ Pro Bowl quarterback will miss a start because of an injury Sunday for the first time in his three-season career after he was not sidelined in college. Purdy was ruled out Friday and won’t play in a critical regular-season game at Green Bay because of an injury he suffered to his throwing shoulder in last Sunday’s 20-17 loss to the Seahawks.

Brandon Allen will start in place of an injured Brock Purdy when the 49ers (5-5) also have to play without Nick Bosa on Sunday at Green Bay (7-3).