ALAMEDA — The Raiders could be without two key offensive pieces Sunday when they face the Minnesota Vikings, co-leaders of the NFC North.

Center Rodney Hudson and running back Latavius Murray both sat out of Wednesday’s practice while limited new information was provided on each player.

Hudson wore a protective boot on his sprained right ankle when he exited the practice field after the team’s early walk-through. He was not on the field during their afternoon practice.

Murray, who suffered a concussion in Sunday’s 38-35 loss to the Pittsburgh Steelers, has not yet been cleared for physical activity and thus was not able to practice or meet with the media. He joined the team for pre-practice stretches before heading to the weight room.

Coach Jack Del Rio spoke before the team’s practice and declined to provide an update on either player, acknowledging only that Charles Woodson (shoulder and knee injuries) would take his normal Wednesday off.

“Everybody that can go, will go,” Del Rio said. “Those that can’t will get with (strength and conditioning coach) Joe Gomes and get some extras, along with Woodson.”

Specifically regarding Murray, Del Rio said, “He’ll do what he’s been cleared to do. I leave that in the trainers and doctors’ hands.”

Murray took a significant shot in the third quarter Sunday from former Raider Mike Mitchell, whose tackle included some inadvertent helmet-to-helmet contact. Murray fumbled on the play, as he appeared dazed immediately after the hit.

Del Rio hasn’t publicly discussed his plan at the position if Murray can’t go, but it could mean increased touches for Marcel Reece, who has the early lead in Pro Bowl fan voting at fullback. No. 2 running back Taiwan Jones had only two carries for zero yards Sunday, and No. 3 back Roy Helu Jr. was a healthy inactive.

Murray’s presence on the practice field could be an indication that he’s moving in a positive direction, though, which is how Del Rio characterized it Monday when he said it “looks like he’s going to bounce back fine from this.”

Hudson, on the other hand, could be more questionable, and the fact that Gabe Jackson is getting work at center is a sign the Raiders are preparing for the possibility of being without their starter.

Hudson has been one of the biggest contributors for an offensive line that’s allowed only 10 sacks through eight games. According to Pro Football Focus, he has allowed just one quarterback hurry in 524 snaps. Tony Bergstrom allowed two in his 16 snaps Sunday, his first offensive snaps since his rookie season in 2012.

Bergstrom, a third-round pick who was general manager Reggie McKenzie’s first-ever draft pick with the Raiders in 2012, was inactive for every game last year and missed 2013 with a foot injury.

“There’s always things to clean up, a few little things that we could have fixed here and there,” Bergstrom said of Sunday’s performance. “The Steelers are obviously a really good team, and the second I went in there, they threw everything but the kitchen sink. Everything and the kitchen sink, to be honest.

“They got in that playbook and went to the back pages, but that’s what any team would do. A new center goes in there, they’re going to test him, see what they can do.”

Bergstrom said he’s stayed ready despite the frustration of going so long without playing.

“Every week I’ve basically gone into every game as though I’m starting, and I try to be as prepared as possible, be as prepared as anyone else who’s going out there, and it’s just become habit,” Bergstrom said.

Wide receiver Amari Cooper didn’t practice Wednesday as well and was listed with a quadriceps injury. He was on the field for the start of practice but headed to the locker room after about 20 minutes. Safety/cornerback TJ Carrie, who missed last week’s game with a hip injury, was a full practice participant. Tight end Clive Walford, who has a quadriceps injury, was also a full participant.

Woodson also is an early leader in the Pro Bowl fan voting at strong safety. Quarterback Derek Carr, Cooper and defensive end Khalil Mack all rank sixth at their position.