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The Chargers built an offensive line to protect Justin Herbert. Two days before their first preseason game, it's already in ruins.

Starting center Tyler Biadasz tore his ACL during a joint practice with the 49ers, dealing a potentially season-altering blow to a Los Angeles team that spent the entire offseason trying to fix its battered front.

The Chargers' offensive line nightmare starts all over again

Tuesday's joint practice between the Los Angeles Chargers and San Francisco 49ers was supposed to be routine - some live reps, a little preseason buzz, nothing more. Instead, it produced the kind of scene that Chargers fans have watched play out with sickening regularity: a key lineman down, a cart on the field, and a season plan suddenly in tatters.

According to ESPN's Adam Schefter and NFL Network's Ian Rapoport, Chargers center Tyler Biadasz is out indefinitely after suffering damage to his ACL and additional injuries to his left knee during Tuesday's joint practice with the San Francisco 49ers. Biadasz, who underwent an MRI after suffering the injury, will meet with more doctors to try to get more clarity.

He went down after 49ers defensive tackle Sebastian Valdez fell into his leg during an 11-on-11 drill. Biadasz remained on the ground for nearly five minutes while being attended to by trainers before he was helped into a medical cart. He had to be carted off and could not put any weight on the leg. 'I don't know exactly what happened but hoping for the best for him,' quarterback Justin Herbert said.

This was supposed to be different. That's the bitter part.

A $30 million fix, gone in an instant

A six-year NFL veteran, Biadasz signed a three-year, $30 million deal with the Chargers in March and was considered a key upgrade for an offensive line group that has perennially struggled to stay healthy. General manager Joe Hortiz went and got his guy - a former Pro Bowler, still only 28, released by Washington in a cost-cutting move - and built the interior around him.

Last season, Pro Bowl left tackle Rashawn Slater suffered a season-ending knee injury during training camp, then L.A. lost right tackle Joe Alt to a recurring ankle injury that cost him 11 games and ultimately required season-ending surgery. Amid those losses up front, star quarterback Justin Herbert was forced to play a heroic brand of football in 2025, managing to carry the Chargers to the postseason. Entering 2026, the top priority for the Chargers was obvious: solidify the offensive line and give Herbert time to propel this offense properly.

The numbers behind Herbert's 2025 season tell the full story of what that line put him through. Herbert faced quick pressure - within 2.5 seconds - on 177 dropbacks. No one else in the league faced more than 150. He went to the postseason anyway. Now, before a single regular-season snap, the wall they built around him has cracked again.

Biadasz arrived as the symbol of reliability that the Chargers desperately needed. Over the last five seasons, Biadasz played in 15 or more regular-season games for the Cowboys and Commanders, earned a Pro Bowl nod in 2022.

Jake Slaughter steps in - ready or not

To general manager Joe Hortiz's credit, he attempted to prepare for a potentially disastrous scenario, spending a second-round pick on Florida center Jake Slaughter and using two sixth-round picks on additional linemen - Logan Taylor and Alex Harkey - in April's draft. For at least almost the entirety of the 2026 season, Slaughter will now start at center barring another move.

Slaughter has never played a regular-season NFL snap. He's a rookie. And now the protection of a franchise quarterback rests on his shoulders from Week 1.

The full extent of the ACL damage has not yet been established, meaning the Chargers have not officially ruled out a return during the 2026 season. However, the injury is expected to keep Biadasz out for a significant period, and a season-ending absence remains possible. The team issued a statement Wednesday saying Biadasz 'underwent imaging later in the day and is currently in the process of gathering additional opinions.'

NFL Network's Ian Rapoport also noted the Chargers added other veteran linemen in the offseason - Kayode Awosika and Cole Strange among them - but none were signed to anchor the position the way Biadasz was.

The injury bug that never seems to leave

The 49ers joint practice, with its live-action reps and high intensity, was the setting. But the Chargers' offensive line misfortune has been a fixture for years, not a fluke. Left tackle Rashawn Slater missed all of last year with a knee injury suffered days after he became the highest-paid offensive lineman in NFL history, and right tackle Joe Alt missed most of it with a high ankle sprain. The timing of Biadasz's injury - two days before the Chargers hosted the 49ers in the teams' second preseason game - is another reminder that this franchise's front-five issues go well beyond bad luck.

New offensive coordinator Mike McDaniel, who arrived from Miami with a reputation for getting creative with protection schemes, now faces his first real test before the regular season has even begun. Herbert, for his part, will need to process the news quickly. The season opener is two weeks away.

Slaughter took his first reps at center Thursday. BoltBeat reported that it is a shame for Biadasz and an organization that banked on him to be able to compete for a title, and that hopefully Biadasz's injuries aren't severe enough to affect his 2027 availability.

That's where this stands: hoping next year isn't ruined too.

Sources