SAN DIEGO — Somehow, Aaron Dobson’s sophomore season has managed to get worse.

Dobson suffered a serious hamstring injury Sunday during the Patriots’ loss to the Packers, and the possibility of him being placed on injured reserve has been raised this week, according to a source.

The severity of the injury has not yet been disclosed, but Dobson was ruled out almost immediately after he hobbled off the field while trying to chase down a deep ball late in the third quarter. Dobson did not practice yesterday when the Pats opened their week of workouts at the University of San Diego.

It was already a brutally difficult season for Dobson, who had a screw inserted in his broken foot during major ankle surgery in March. That kept him out of the Patriots’ entire run of offseason workouts, and he didn’t debut at training camp until Aug. 11. It took an extra couple weeks to earn a full workload at practice.

Dobson suffered a stress fracture midway through his rookie season. The 2013 second-round draft pick caught 37 passes for 519 yards and four touchdowns, but he has been held to three catches for 38 yards this season and hasn’t caught more than a single pass in any game.

Because of the injury and delayed development, Dobson has been a healthy scratch eight times this season, including five consecutive games before Sunday’s tilt with the Packers.

Edelmania

Wide receiver Julian Edelman has been dealing with a thigh injury since landing hard on a yardage marker in Week 11 against the Colts, and he aggravated it during Sunday’s third quarter, which kept him off the field for a handful of plays.

He practiced on a limited basis, but didn’t really hide the fact that he is going through something.

“I’m feeling a day better than yesterday,” Edelman said.

Edelman, who leads the Pats with 77 receptions and is second with 743 yards to go along with two touchdowns, has a Wes Welker-like knack for taking a vicious knock and quickly returning to the field. That’s why there isn’t any real doubt that he’ll be ready for Sunday’s game against the Chargers.

“That’s my job,” Edelman said. “When you’re looking over to the left and to the right, you do it for your teammates.”

Jonesing for work

Defensive end Chandler Jones actively participated in an agility drill during the media portion of practice. He leaped over a couple bags before bending over to pick up a fumble in a fundamental drill for the defensive linemen.

Jones has missed five games with a hip injury but has been a limited participant at practice since last week. It’s still unclear if he’ll play on Sunday.

Defensive lineman Sealver Siliga also practiced for the second time since Friday when the Patriots started the 21-day clock on his return from short-term injured reserve. Siliga is eligible to play if the Patriots believe he is ready.

Legend of Belichick

Bill Belichick has the reputation of doing some great things to prepare his teams for any circumstances, but there was a half-hour stretch when stuff just got a little bizarre.

It has rained the past two days in San Diego, which is about as rare as it gets in the sunny city.

“Maybe Bill has some connections with the weather team here,” cornerback Darrelle Revis said jokingly.

Safety Devin McCourty added, “Maybe we’ll bring snow tomorrow.”

And Edelman also fed into it in a third and completely separate interview.

“It feels kind of like Foxboro in the spring with the rain, and I’m sure coach probably had something to do with that,” Edelman said.

Numbers game

Tight end Rob Gronkowski entertained a small crowd of fans who staked out the practice location. The Pats practiced in numberless shirts, likely because passersby could view the workout in several locations, so Gronkowski used white tape to inscribe the number 69 on the back of his blue shirt, which drew the loudest cheer from the crowd as players walked to the field.

Not surprisingly, Gronkowski had to ditch his new number when practice started.