Chargers quarterback Taylor had lung punctured by medical staffer.

Chargers medical staff member erred when giving pregame shot for injured rib.

Rookie Justin Herbert will make his second start Sunday for the Chargers against Carolina as Tyrod Taylor continues to recover from a medical accident.

Taylor was unable to play last weekend after difficulty breathing following a pregame injection that inadvertently punctured his lung. A member of the team’s medical staff erred during a procedure meant to help Taylor manage pain from a preexisting rib injury.

“There [were] complications with the shot,” coach Anthony Lynn said. “… I know it wasn’t intentional. Everyone makes mistakes. Can’t explain it. Just what happened.”

The NFL Players Assn. is conducting an investigation.

Taylor, a captain this season, was on the practice field Wednesday with his teammates but not participating in any physical activity. He will remain out indefinitely, the exact timetable for his return depending on the severity of the new injury. A medical source said a typical recovery in such situations takes “weeks not months.”

Lynn, who also worked with Taylor when the two were in Buffalo, called Taylor an “extremely classy young man” and noted the toughness he displayed in playing with his rib injury during a Week 1 victory in Cincinnati and with this setback.

“He’s been real professional about it,” Lynn said.

Pregame injections for pain are not uncommon in the NFL. The procedure administered to Taylor also is a standard practice when the issue involves the ribs. Under normal circumstances, the player is advised of the risks and of alternative options and gives consent to be treated.

“This is a very reasonable procedure,” said Dr. Vernon Williams, the founding director of the Center for Sports Neurology and Pain Medicine at Cedars-Sinai Kerlan-Jobe Institute. “But, like always, there are risks involved. The relative risk in this sort of procedure is very low. The benefits far outweigh the risks.”

In his 10th NFL season, Taylor is well respected among his teammates. Lynn noted that he received more votes to be a captain than any player has since Lynn became the Chargers head coach in 2017.

Noting that it “wasn’t his fault he wasn’t on the field [last weekend],” Lynn has repeatedly said Taylor will return as the team’s starting quarterback when he is fully healthy.

That didn’t change after Herbert completed 22 of 33 passes for 311 yards and a touchdown a 23-20 overtime loss to the Kansas City Chiefs, the defending Super Bowl champions.

Asked about his unyielding public support of Taylor, Lynn explained that he owed that much to his quarterback specifically, and his team in general.

“When something like this comes up … it’s different when you go out there and you don’t play well and I take you out,” Lynn said. “Under these circumstances, guys need to know that not just the head coach but every coach on this staff has their back. I think that’s very important to have that trust and credibility with your team.”

This isn’t the first time this organization has had issues with its medical staff. Former longtime team doctor David Chao stepped down in 2013 following a series of controversies. At one point, the NFLPA demanded that Chao be replaced.

Lynn defended the team’s current staff and said the players would determine if potential problems exist.

“Since I’ve been here, our medical staff has been really trustworthy,” Lynn said. “But, how they [the players] respond to this, I don’t know. That’s going to be up to the locker room. As of right now, I like the progress we’ve made with our players and our medical staff.”

The team lists four team doctors and has additional personnel on the sidelines.

Etc.

The Chargers signed veteran safety Jahleel Addae to their practice squad. Addae, 30, previously played with the team from 2013 to 2018. … Starting defensive tackle Justin Jones (shoulder) was among the Chargers who didn’t practice Wednesday. Henry (ankle), right tackle Bryan Bulaga (knee), safety Rayshawn Jenkins (quadriceps) and defensive back Desmond King (back) were limited.