ALAMEDA — The Raiders have figured their left side of the offensive line to be locked in for some time.

Veteran left tackle Donald Penn, second-year left guard Gabe Jackson and highly-paid free agent center Rodney Hudson, barring injury, have been etched in stone all offseason.

The right side was considered a different story, but so far J’Marcus Webb and Menelik Watson look to have taken charge and played well at those spots.

“The right side is doing a terrific job,” offensive coordinator Bill Musgrave said. “They have gelled together. The offensive line is really an entire unit. So the more time on task that they get, those five guys, we expect better and better results.”

Webb came to the Raiders having played exclusively at tackle, including a three-year run as the Chicago Bears’ left tackle. He only played sparingly the past two years with the Minnesota Vikings, but Musgrave likes the work he’s seen in his transition to guard.

“There’s a lot of speculation there, because he didn’t have a lot of guard work in his history,” Musgrave said of Webb. “He does a nice job of pass protection, probably likes it better than being out there on the edge, and then in the run game, he gets better every day.”

Watson, the Raiders’ second-round pick in 2013, started nine games last year and said he and Webb are growing together.

“Me and J’Marcus are still a work in progress,” Watson said. “But at the same time, we do love and respect each other and that always helps. He knows I’ve got his back and I know he’s got my back.”

On Latavius Murray’s longest run of the night in last week’s preseason game in Minnesota, Webb stonewalled the tackle in front of him, Watson got to the second level to seal off a linebacker and Jackson pulled from the left side to take care of the defensive end line up in front of Watson. Murray picked up nine yards on the play, assisted also by a block from Mychal Rivera as the tight end pulled from a wing position on the left side.

Two plays later, Carr connected with Amari Cooper for a big 40-yard completion. The Vikings blitzed a safety to the right of Watson, who correctly stayed on his man as running back Taiwan Jones picked up the defender and kept a clean pocket for Carr to deliver the deep ball.

That drive was capped with a 2-yard touchdown run by Murray behind a hole created from a combination block by Webb and Watson.

“Behind Gabe and Donald, we can pick up runs and behind me and J’Marcus, we’re showing we can pick up runs too,” Watson said. “It’s good for the line in general, especially other teams trying to scout us. They’re going to have to prepare for each side of the football.”

Carr typically gushed about his line, a unit that could be improved from the one that was sixth in the NFL in fewest sacks allowed last season.

“I’m always biased, but I think we have the best line,” Carr said. “I’ll always think that no matter what because I love those guys. I think they’ve been doing a great job. They’re going to tell you that they have a lot of things to get better at and they can point those things out to you. To me, I think they’re doing a great job and they work hard at it.”

* Veteran defensive end Justin Tuck and rookie tight end Clive Walford weren’t suited up at Friday’s practice during the portion open to the media. That makes it unlikely either will play Sunday against the Arizona Cardinals. Both also missed last week’s game.

Del Rio only went as far as to say he wouldn’t “confirm nor deny” any assumptions that those not suited up recently wouldn’t play.