In a flurry of activity, the San Francisco 49ers have made significant moves to reinforce their defense in the early stages of free agency. With Coach Robert Saleh now leading the New York Jets, the 49ers have turned their attention to filling crucial positions on their roster.

Firstly, former 49ers defensive tackle Javon Kinlaw has agreed to a one-year deal with the Jets, reuniting him with Coach Saleh. Kinlaw, who had an impressive 2023 season after a challenging start to his career, will bring his stellar play to New York. The 49ers will now have to find a suitable replacement for Kinlaw on their defensive line.

To bolster their defensive line, the 49ers plan to sign defensive lineman Yetur Gross-Matos to a two-year contract worth up to $18 million. Gross-Matos, known for his versatility and ability to line up inside, will provide quality depth to the 49ers' defensive line.

In addition to strengthening their defensive line, the 49ers have made moves to secure their other positions on defense. The team has tendered a one-year contract worth $4.89 million to wide receiver Jauan Jennings, who has the option to negotiate with other teams. If Jennings chooses to sign with another team, the 49ers will receive a second-round pick as compensation. General Manager John Lynch has expressed interest in signing Jennings to a long-term extension, indicating the team's investment in his future.

The 49ers have also found a bookend for star pass rusher Nick Bosa in the form of linebacker Leonard Floyd. Floyd, who is coming off a career-high 10 1/2-sack season with the Buffalo Bills, has agreed to a two-year deal with the 49ers. Despite being 31 years old, Floyd has shown durability and consistency, having recorded at least nine sacks in each of the last four seasons.

On the offensive side, the 49ers bid farewell to tight end Charlie Woerner, who has signed a three-year deal worth up to $12 million with the Atlanta Falcons. Woerner, known for his blocking abilities and special teams contributions, leaves a void in the 49ers' receiving game. The team will now look to find a tight end who can be a bigger threat in the passing game alongside George Kittle.

Finally, the 49ers have re-signed quarterback Brandon Allen to maintain a veteran presence in the backup quarterback position. Allen, who served as the team's third-string quarterback in 2023, will continue to support starter Brock Purdy. The team remains open to further fortifying their backup QB spot, but it remains uncertain if Sam Darnold will fit within their financial constraints.

With these moves, the 49ers have addressed crucial areas of concern on their roster, ensuring they remain competitive in the upcoming season. As the team continues to shape its roster, anticipation builds for an exciting 2024 campaign.

Note: The article has been written based on the information provided and does not include any additional information beyond what was mentioned.