The San Francisco 49ers are facing a difficult situation as quarterback Brock Purdy experiences back soreness, rendering him day-to-day ahead of their Week 4 game against the New England Patriots.

This development comes as the 49ers have already ruled out key players like wide receiver Deebo Samuel, tight end George Kittle, and running back Christian McCaffrey. Should Purdy be unable to play, Brandon Allen would step in as the starting quarterback.