San Francisco 49ers coach Kyle Shanahan announced that most of the starting team, including quarterback Brock Purdy, will likely not participate in the upcoming preseason opener against the Titans. The team's offensive situation is complicated by ongoing trade talks and injuries to key players. Purdy has been praised for his efforts to improve his mobile throwing accuracy, but the lack of veteran support during practice has affected his performance.

• The 49ers are being cautious with their starters, including Purdy, as they navigate injuries and trade talks.
• Purdy's performance has been impacted by the absence of veteran players during practice.