Najee

On a play-action pass, Chargers running back Najee Harris crumpled to the turf before the fake handoff could fully develop, immediately grabbing his left ankle and tossing aside his helmet in pain.

Needing assistance, trainers helped Harris to the sideline, as he was unable to put any weight on his leg, before he was carted to the locker room in the second quarter of a 23-20 win over the Denver Broncos at SoFi Stadium on Sunday.

Harris, who spent the lead-up to his first season in L.A. recovering from an offseason eye injury in a fireworks accident, was expected to be a key piece of a one-two punch with rookie Omarion Hampton.

Now, he appears to be sidelined for the season with an Achilles injury, according to head coach Jim Harbaugh, who called the diagnosis “preliminary” as Harris underwent postgame imaging.

“Not good,” Harbaugh said of his emotions as the play unfolded. “[I was] just hoping for the best — maybe a high ankle, something else that wouldn’t be long-term.”

Speaking at the podium with a somber tone, Harbaugh said he met with Harris at halftime and described the running back’s demeanor as “cold-blooded,” adding that he told him: “You’ll be back, kid.”

The injury appeared clear on film, according to Dr. Dan Ginader, physical therapist and author of “The Pain-Free Body,” who reviewed video of the play.

“When looking at the calf of the back plant leg, you can see the muscle sort of ‘jump’ which is indicative of a complete tear of the Achilles,” Ginader said. “Players who have suffered this injury often describe it as being hit in the heel with a shovel. … When you see the muscle jump and see the player crumble to the floor, you can be pretty sure it’s a complete tear.”

Before going down, Harris had been featured early Sunday, carrying six times for 28 yards. Durable throughout his career, he had appeared in all 71 games across five NFL seasons before the injury.

If it’s a complete tear, the earliest Harris could return is about eight months, Ginader said, though most players don’t feel fully themselves “until at least 12 months” post-surgery. For a skill player, he added, “it takes longer to be able to come back at full force.”

With Harris out, Hampton is expected to shoulder a bigger role moving forward. Hampton, who calls Harris a mentor, admitted the loss stings.

“It definitely hurts,” Hampton said.

Running back Najee Harris addressed reporters for the first time since being involved in a Fourth of July fireworks accident — his eyes hidden by Chargers-colored sunglasses.

“It’s a humbling experience,” Harris said about the accident that left him with an eye injury. “It still hasn’t really shaken. I’m still going through it in a way. Just the whole situation [can] show you how things could change at just a snap of a finger.”

Harris declined to describe the accident in detail, but said he feels blessed the incident wasn’t worse. He said his vision wasn’t affected, reiterating that the injury was superficial.

“I’m just happy that everybody’s safe and we’re alive,” Harris said.

Cleared for contact Monday after wearing a non-contact jersey last week, Harris took another step toward suiting up for the season opener in São Paulo, Brazil, against the Kansas City Chiefs on Friday.

Harris has been wearing a tinted visor — a new look compared with his days with the Steelers — and keeping sunglasses on off the field since the accident, which has fueled online speculation about the severity of his injury. However, he brushed off the chatter.

“It’s not my job to care what other people think,” Harris said. “It’s my job to do what I got to do, so they can write what they want to, say what they want to.”

Harris has never missed an NFL game, starting in 68 straight contests over four seasons in Pittsburgh, but that streak could be in jeopardy. He said he expects to play as his workload ramps up.

“We’ll see where it takes us. … I’m just recovering, getting in shape,” Harris said. “Just trying to stay on top of the playbook. I was on [the non-football injury list], so [that] makes things a little more difficult.”

Coach Jim Harbaugh, typically tight-lipped on injuries, said there is “a possibility” Harris will play against the Chiefs. Since being cleared to practice, Harris has looked “really, really good,” Harbaugh said.

Whether Harris is ready before the team boards its 12-hour flight or becomes a game-time decision remains uncertain.

In Harris’ absence, rookie Omarion Hampton has handled most of the carries in camp but welcomed his teammate’s return. The pair is expected to share duties in offensive coordinator Greg Roman’s system.

“It’s been amazing, he’s my guy,” Hampton said. “We talk all the time. He helps me out on reads. I help him out seeing what we see, how we see it.”

Chargers running back Najee Harris likely will begin training camp on the non-football injury list, general manager Joe Hortiz said Wednesday, after the running back suffered a minor eye injury during a fireworks incident on July 4.

As veteran teammates reported for camp Wednesday morning, Harris was still getting evaluated by doctors in the Bay Area and was expected to join the team later in the day.

“Everything that’s been relayed to us has been positive,” Hortiz said.

Harris suffered a “superficial” eye injury in a holiday weekend fireworks accident, according to a statement from his agent, Doug Hendrickson, and was “fully expected to be ready for the upcoming NFL season.”

The Chargers’ medical team has remained in contact with Harris and his local doctors, said Hortiz, who reported Harris was in good spirits and more worried for a friend who was more severely injured. While the general manager wanted to save final judgment on Harris’ availability until the prized free-agent acquisition could be seen in person by the Chargers staff, Hortiz didn’t anticipate that Harris would be sidelined for long.

“We’ll let him get himself ready and then he’ll get out there,” Hortiz said.

The Chargers will begin training camp Thursday with five players on the physically unable to perform list, including receiver Mike Williams and safety Elijah Molden. Both key players could return to practice soon, Hortiz said.

Molden missed the offseason program after undergoing knee surgery to repair a torn meniscus, but told reporters in April he was prepared to return fully for training camp.

Williams, who is two years removed from tearing his anterior cruciate ligament, is not sidelined because of a pre-existing injury, Hortiz said, and is working back from an injury suffered during the spring after the 30-year-old returned to the team as a free agent.

“Just working through something small,” Hortiz said, “and he could be out there any day.”

The Chargers, who open the preseason on July 31 in the Hall of Fame Game, are the first team to report to training camp. The early arrival put rookie Tre’ Harris in a precarious position as he became the first holdout in a log-jam of 30 unsigned second-round picks.

The receiver who was picked 23rd in the second round (55th overall) had not reported to training camp yet, Hortiz said Wednesday, four days after fellow Chargers rookies arrived.

As NFL training camps begin soon, the league is in a standoff that began when the Houston Texans signed the second pick of the second round, receiver Jayden Higgins, to a four-year, $11.7-million, fully guaranteed contract in May. It was the first time a pick outside of the first round had inked a fully guaranteed deal. The Browns, who picked linebacker Carson Schwesinger one slot ahead of Higgins in the second round, then followed suit with another fully guaranteed contract.

Now teams, agents and the remaining 30 second-round picks are left waiting for the next domino to fall.

“I wish I could put a crystal ball on it,” Hortiz said when asked of his prediction on when Tre’ Harris’ deal could be done. “I hope it’s done soon. I hope he gets out here in practice. Practice is vital for everyone. Not just him, everybody. There’s a reason we come to camp and you want to hit the ground running Week 1.”

Offensive tackle Rashawn Slater reported for training camp Wednesday amid his own contract negotiations as the star left tackle is in line for a lucrative extension. Coming off his second Pro Bowl appearance, the 26-year-old Slater is due to make $19 million in the last year of his contract, the sixth-highest salary among left tackles this season, according to overthecap.com. He did not join the team for voluntary workouts this offseason, but returned for mandatory minicamp. Hortiz expects Slater to participate in training camp while contract talks progress.

“We’re working through it,” Hortiz said. “Like any high-level negotiation … they just take time. But every conversation’s been great. Both sides, we’re making progress. We’re feeling good about it.”

Chargers running back Najee Harris sustained a minor eye injury during a holiday weekend fireworks accident, but the prized free-agent signing will be ready for the upcoming season, his agent confirmed to The Times on Thursday after reports and online rumors prompted speculation of a more severe injury.

“Najee Harris was present at a 4th of July event where a fireworks mishap resulted in injuries to several attendees,” Harris’ agent Doug Hendrickson said in a statement. “Najee sustained a superficial eye injury during the incident, but is fully expected to be ready for the upcoming NFL season.”

With four 1,000-yard rushing seasons in Pittsburgh, Harris is expected to bring an immediate boost to a Chargers running game that sputtered last season in offensive coordinator Greg Roman’s first year. Harris, who signed a one-year deal worth up to $9.25 million, will pair with first-round pick Omarion Hampton in the backfield as the Chargers hope to make back-to-back playoff appearances for the first time since 2008 and 2009.

The Chargers begin training camp on July 17 as one of the first teams to begin preparations for the upcoming season. The Chargers will play the Detroit Lions in the Hall of Fame Game on July 31 and open the regular season in Brazil on Sept. 5 against the Kansas City Chiefs.