49ers activate player from IR, place another on IR ahead of Week 5 matchup vs Cardinals.

The San Francisco 49ers made several roster changes ahead of their Week 5 matchup against the Arizona Cardinals, including activating a player from Injured Reserve and placing another on it. Running back Christian McCaffrey is dealing with Achilles tendonitis, while quarterback Brock Purdy has shown improvement. The team is focused on countering the Cardinals' strong ground game and has shared updates on player strategies and injuries.