SANTA CLARA -- Linebacker Aldon Smith, last season's team MVP for the 49ers, is recovering from recent minor shoulder surgery, a league source confirmed.

The NFL Network reported Smith underwent surgery "a few weeks ago" to repair a torn labrum.

Smith told the Bay Area News Group on Feb. 15 that his shoulder injury stemmed from a nerve problem -- "a bad stinger, " he said -- dating to a Nov. 19 win over the Chicago Bears. Speaking after a mixed-martial-arts training session in San Jose, he made no mention of a torn labrum.

Smith's surgery was not related to his MMA training session, a league source said.

Smith's recovery time is unknown. A 49ers spokesman declined to comment on the report, stating, "We don't discuss the particulars of injuries."

Smith set a franchise record with 19½ sacks but had none over his final six games, including the 49ers' Super Bowl loss. He appeared to initially injure his left shoulder in a Nov. 11 tie against the St. Louis Rams but still had 5½ sacks the following game against the Bears. Smith did not miss any games last season but was limited in practice since December.

Smith sparred for nearly an hour Feb. 15, showing no shoulder hindrance.

"It's doing good," Smith said then of his shoulder. "I was on the mat, playing around and doing fine."

In a pledge related to his 19½ sacks, Smith will present a $99,432 check Wednesday to the Boys & Girls Clubs of San Francisco and the Peninsula.

  • Charles Woodson's final three seasons with the Raiders overlapped with Nnamdi Asomugha's first three (2003-05). A reunion could be in the making eight years later with the 49ers, according to a former teammate.

    Akbar Gbaja-Biamila, a retired player and current NFL Network analyst, reported that the 49ers are "in serious discussions" with Woodson and Asomugha, two free agent defensive backs. It's unknown if the extent of those "discussions" is anything beyond this week's free agent visits to Santa Clara.

    Woodson's agent, Carl Poston, did not respond Friday for a request seeking comment, nor did Asomugha's agent, Ben Dogra. Woodson visited the 49ers on Wednesday and left without a contract offer, Poston said.

    The 49ers' vacancy at free safety still could be filled by a veteran free agent, but it won't be Louis Delmas, who returned Friday to the Detroit Lions on a two-year deal. Baltimore Ravens free agent Ed Reed might still be in play for the 49ers. Reed, who had an interception in last month's Super Bowl win over the 49ers, concluded his visit with the Houston Texans on Friday without signing a contract.

    In reporting that Asomugha left the 49ers facility after 8 p.m. Thursday, Gbaja-Biamila hinted on Twitter about Asomugha's and Woodson's imminent signing: "I predict The Bay Area will return two of its favorite sons in free agency."

    Gbaja-Biamila played linebacker for the Raiders in 2003-04.

  • Linebacker Dan Skuta said a variety of the 49ers' attributes -- along with the Bay Area's beauty -- convinced him to sign a two-year deal Thursday. "The scenery on the way in definitely was a good selling point," Skuta said on a media conference call. "Being from Michigan, it's covered in snow right now. Being out here, it's just amazing, coming over the mountains and everything."

    Skuta will be asked to stabilize a special-teams unit that had early-season struggles before key breakdowns in the Super Bowl. While he's also "excited to learn" behind All-Pro inside linebackers Patrick Willis and NaVorro Bowman, Skuta's role might also include being a short-yardage back, as he was used in limited fashion for the Cincinnati Bengals in 2010.

  • Steve Young, whose Hall of Fame career ended with a concussion in 1998, is endorsing a mobile app designed to help recognize such head trauma. PAR's Concussion Recognition and Response app is free on Apple's App Store or Google Play through March, which is Brain Injury Awareness month.

  • Defensive lineman Glenn Dorsey's two-year deal that he signed Wednesday is worth $6 million with a $2.285 million signing bonus, Comcast SportsNet Bay Area reported.

  • Offensive lineman Daniel Kilgore is the honorary starter for NASCAR's Food City 500 at Bristol Motor Speedway in his native Tennessee.

    For more on the 49ers, see Cam Inman's Hot Read blog at blogs.mercurynews.com/49ers. Follow him on Twitter at twitter.com/CamInman.