Chargers’ Tyler Biadasz suffers left ACL injury in 49ers joint practice, opening door for Jake Slaughter at center

The Los Angeles Chargers received a jarring preseason update on Thursday when head coach Jim Harbaugh said veteran center Tyler Biadasz suffered a left ACL injury during a joint practice with the San Francisco 49ers on Tuesday. The injury immediately changes the shape of the Chargers’ interior line competition as they head toward the stretch where final roster decisions will tighten.

Harbaugh’s comments, delivered after Thursday’s preseason game, framed the timeline of the injury in clear terms. Biadasz sustained the ACL injury to his left knee in the practice setting, not during the game itself. That detail matters for how teams often evaluate next-step options, because the starter at the position typically becomes a question of preparation, communication, and continuity with the quarterbacks and other linemen.

With Biadasz sidelined, the Chargers’ path to depth at center now turns toward Jake Slaughter. The team’s offseason work and roster planning place a premium on being able to keep the offense operating normally when the snapper and primary line communicator cannot do the job. A center’s role runs beyond the handoff exchange, especially in pass protection calls and protections at the line of scrimmage.

The Chargers’ immediate interest in Slaughter is the clearest football takeaway from the update. Slaughter has been positioned as a potential solution to the center vacancy, and the team’s framing suggests they view his readiness as a legitimate step toward a starting role in 2026. That does not guarantee a final outcome, but it does report that the coaching staff is actively evaluating him as the most direct replacement option.

The injury also carries broader implications for the 49ers and Chargers as teams continue to use joint practices to sharpen timing and evaluation. The same practice atmosphere that allows offensive and defensive units to measure themselves against live looks can also lead to injuries that ripple into regular-season roster plans. Both staffs will now pivot to how they manage reps and workload for players whose roles may expand.

For the Chargers, the next watch items are practical: who takes the majority of first-team center snaps in the coming sessions, how quickly the unit develops cohesion, and whether the team needs to adjust protection schemes to fit the replacement’s strengths. The center spot often influences the rhythm of the entire line, so the answer can show up quickly in communication consistency and assignment execution.

Biadasz’s injury is the kind that typically prompts long-term planning, and the reported left ACL tear raises the stakes for the organization as it manages the calendar. Still, the team will be careful not to overstate timelines, given that ACL recovery can vary by case. In the near term, Los Angeles will focus on building stability at center while they work through the preseason and final lineup decisions.