The 49ers are preparing for the free agency frenzy, with Jon Weeks re-signing on a one-year deal after his debut for the team. The team did not use the franchise tag on any of their 20 players set to become unrestricted free agents. However, more could become available as last-minute salary-cap casualties. Wide receiver Jauan Jennings, who has been with the 49ers for six years, is expected to cash in after six. Other major issues include Trent Williams' contract status, quarterback Mac Jones' trade market, and the enormous cost of potential acquisitions.