CHARLOTTE — The Panthers enjoyed a successful day on the field in their joint practice with the Jets, but a number of injuries cropped up that created some concerns at two positions in particular.

The Panthers opened practice without starting cornerback Dane Jackson, and head coach Dave Canales said it was serious and he could miss "six-weeks-ish."

"Dane's was a significant hamstring," Canales said.

That news came as cornerback Jaycee Horn was on a rep count Thursday, limiting his work against Aaron Rodgers and the Jets.

They were also without veteran safety Xavier Woods, and Canales said the groin injury that limited him in recent days could cost him a "couple of weeks."

"A little bit more serious than we thought," Canales said.

Defensive coordinator Ejiro Evero has said he considers backup Nick Scott a starting-caliber safety, but the depth at corner is not as established.

When Horn wasn't out there, they had Lamar Jackson and D'Shawn Jamison working with the starting defense alongside veteran nickel Troy Hill, with Dicaprio Bootle and Chau Smith-Wade getting lots of work as well. Jackson, Jamison, and Bootle are all holdovers from last year, while Smith-Wade was their fifth-round pick.

Guard Chandler Zavala left the practice on a cart after sustaining a hamstring injury, and Canales said the early prognosis was not great.

Zavala was working with the starting line, as free agent pickup Damien Lewis was in uniform but limited after missing a few days for personal reasons.

Zavala was among the five healthy linemen who finished last week's preseason opener, and he played every snap.

With him and Lewis unable to finish practice, former starter Brady Christensen worked at left guard with the ones.

"So we're concerned about that one," Canales said of Zavala. "It feels like it could be a little bit of a longer deal. And he was doing fantastic in this camp."

They appeared to dodge a few bullets, as starting running back Chuba Hubbard went down after a big hit and was getting a knee issue checked out.

Cnaales said the early indications were all good on Hubbard, who appeared to slip just before taking a huge shot from Jets safety Chuck Clark.

"We had big concerns there," he said of his starting running back. "The initial testing looks pretty good, so they're going to follow up, we'll have more information on him there. . . .

"It wasn't a dirty hit, it was two guys faced up on each other. And his foot kind of gave out from underneath him. So the initial testing was very positive, but we're going to do all the follow-ups and make sure that he's fully ready to go before we put him back out there."

Right guard Robert Hunt left practice to get checked by the athletic training staff as well but came back to finish practice, which was encouraging to Canales.

"That's the message for the team, right? What can you practice with? What can you play with?" Canales said. "Let's do that. Let's push the envelope there. It says something.

"He sends a message as a veteran guy to say, no, I'm ok. Talking and making sure we're all being really smart about it and then saying, I'm good; I'm ready to go. Knowing yourself, knowing who you are, getting back out there to take advantage of the work that we're doing."

Canales also mentioned that rookie Kenny Dyson (groin) suffered what could be an injury that could cause him to miss time.

Veteran wideout Diontae Johnson was out again with a groin injury that Canales termed "something mild," and that outside linebacker Jadeveon Clowney getting a day off was about looking after his long-term viability.