When it comes to the 49ers offensive line and the season opener, the most important names will be: B.J. Raji, C.J. Wilson, Ryan Pickett, Jerel Worthy, Clay Matthews, A.J. Hawk and Desmond Bishop.

Those are among the Green Bay Packers defenders that will be trying to breach the line of scrimmage Sept. 9 in Lambeau Field.

Who will block them? Virtually the same 49ers linemen from a year ago, with one exception: Alex Boone possibly taking over at right guard in place of Adam Snyder (now with the Cardinals) and Chilo Rachal (Bears).

“Alex Boone had the first shot at that and he’s doing a phenomenal job,” coach Jim Harbaugh said Wednesday. “There will be competition of course, but he’s doing outstanding.”

Boone’s expected competition will come from second-year lineman Daniel Kilgore, who’s also been working as an understudy to center Jonathan Goodwin, as has rookie Jason Slowey.

Derek Hall and Chase Beeler also saw time at right guard during Wednesday’s drills while another candidate, Mike Person, lined up as the second-string left tackle. Fourth-round draft pick Joe Looney also will be in the hunt once he’s cleared from a foot injury.

Harbaugh virtually has ruled out moving Anthony Davis inside from right tackle, adding on Wednesday: “Another guy that’s standing out is Anthony Davis. Really good with his footwork. That’s been much improved. Knowing the system, veteran guy now. Seen a big jump in his play as well.”

Left tackle Joe Staley is coming off his first Pro Bowl berth, and left guard Mike Iupati is looking to build off a sophomore year in which he was a Pro Bowl alternate. The primary backups at left tackle would be Boone, Person, and rookie Al Netter; at left guard it’s Garrett Chisolm and David Gonzales.