why is brock purdy not playing

Brock Purdy is not playing because he is sidelined with a toe injury similar to turf toe and a left shoulder injury. The injuries, especially the toe injury, are significant enough to prevent him from playing, causing him to miss multiple weeks. Early estimates expected him to be out for 2 to 5 weeks, and he was ruled out for Week 2 against the New Orleans Saints. While there is slight hope he might return as soon as Week 3, the San Francisco 49ers are not optimistic about his near-term return. In his absence, Mac Jones is starting as the quarterback for the 49ers.