The San Francisco 49ers have made a surprising move by signing veteran offensive lineman D.J. Humphries, a former Pro Bowler in 2021. Announced on April 29, 2025, just days after the 2025 NFL Draft, this decision has sparked speculation about Humphries’ role in the team. With the 49ers failing to draft a tackle and losing swing tackle Jaylon Moore to the Kansas City Chiefs, their plan for Humphries appears to involve bold strategies that could reshape the offensive line.
Context: An Offensive Line Lacking Depth
The 49ers’ offensive line faces significant challenges. Trent Williams, their star left tackle, remains one of the NFL’s best but is 37 years old with a concerning injury history, including a persistent ankle issue that sidelined him for seven games in 2024. Meanwhile, right tackle Colton McKivitz is only signed through the 2025 season, and the team lacks reliable backups after Moore’s departure. Drafting just one offensive lineman, Connor Colby, in the seventh round further highlights the depth issue at tackle.
It is in this context that the 49ers brought in Humphries, a player with 100 career starts, primarily at left tackle. However, the way the team plans to utilize him is a major surprise, far beyond a mere backup role.
Humphries’ Role: Swing Tackle or Williams’ Heir?
According to sources from Sports Illustrated and The Athletic, Humphries was signed to a one-year deal to compete for the swing tackle role, serving as a backup capable of playing both left and right tackle as needed. This is a critical position, especially given Williams’ frequent injuries and McKivitz’s inconsistent performance as a starter. Humphries, with his extensive experience and ability to protect quarterback Brock Purdy, is expected to bring stability and versatility to the offensive line.
The truly shocking aspect, however, is the speculation that Humphries could be a potential successor to Trent Williams. Analysts like Grant Cohn of Sports Illustrated suggest the 49ers may be preparing for a scenario where Williams retires, particularly if his ankle injuries worsen. At 31, Humphries, despite recovering from a 2023 ACL injury, is still considered one of the top left tackles when at his peak. Signing him could be a strategic move to ensure the team avoids a crisis if they lose their cornerstone in Williams.
Challenges and Risks
While ambitious, this plan is not without risks. Humphries struggled in 2024, playing just 92 snaps for the Chiefs, allowing three sacks and 11 pressures in 69 pass-blocking snaps, earning a career-low Pro Football Focus grade (44.8 overall, 30.5 pass-blocking). His 2023 ACL injury and subsequent hamstring issues raise doubts about his ability to return to elite form. Additionally, Humphries has primarily played left tackle and has limited experience at right tackle since his rookie season (2016), which could complicate matters if he’s asked to fill in for McKivitz.
Moreover, the 49ers’ lack of transparency regarding player injuries, such as the late disclosure of Malik Mustapha’s ACL injury, fuels speculation that they may be downplaying issues with Williams. If Williams suffers a serious setback, Humphries could face far greater responsibilities than anticipated, placing immense pressure on a player still in recovery.
Impact on Long-Term Strategy
Signing Humphries is not just a short-term fix but reflects the philosophy of head coach Kyle Shanahan and GM John Lynch in building the roster. Rather than forcing a tackle selection in the draft when targets didn’t align with their board, the 49ers opted to add a veteran like Humphries, who brings experience and flexibility. Furthermore, per NBCSports, the post-draft timing of the signing ensures it doesn’t impact their 2026 compensatory pick formula, showcasing meticulous planning.
Humphries is also valued for his intangibles. According to Donnie Druin of Cardinals on SI, he is a “great locker room presence” due to his authentic personality and respect from teammates. This could bolster team cohesion, especially under the high expectations for the 2025 season.
Conclusion: A Bold Gamble
The San Francisco 49ers’ signing of D.J. Humphries is a daring move, addressing the immediate need for offensive line depth while laying the groundwork for a future without Trent Williams. However, the plan carries significant risks, from Humphries’ health to his ability to adapt to a new role. If successful, Humphries could be a key piece in protecting Brock Purdy and maintaining the 49ers’ dominance in the NFC West. If it fails, the team risks a major gap in the offensive line, jeopardizing their Super Bowl aspirations.
The biggest question remains unanswered: Is Humphries truly the “heir” to Williams, or merely a temporary backup? The answer will become clearer as training camp unfolds, with all eyes on the performance of this 31-year-old veteran.