Brandon Allen has been named the starting quarterback for the San Francisco 49ers in Week 12, replacing Brock Purdy who is dealing with a shoulder injury. Coach Kyle Shanahan expressed surprise at the severity of Purdy's pain during practice, leading to this decision. Allen's first start since 2001 comes as the 49ers face the Green Bay Packers, with potential for him to start multiple games if Purdy's injury lingers.

• Brandon Allen's experience as a starter is limited but he has had some success in the past.
• The 49ers may need to rely on Allen for multiple games depending on Purdy's recovery.