After a second opinion in Los Angeles, Oakland Raiders left tackle Jared Veldheer has decided to undergo surgery on his partially torn triceps Friday morning, a source said.

Raiders LT Jared Veldheer will need surgery on his torn left triceps and will miss a significant portion of the season. AP Photo/ Bill Nichols

This type of surgery has a three-month recovery period, according to a medical source. The surgery is expected to ensure that he will return to full strength.

Veldheer, 26, could return later in the season if the Raiders still need him, and he wants to play as soon as possible.

He was hurt at the end of a practice on Aug. 3. His first MRI came back negative, but his second one showed a partial tear that led to him seeking Thursday's second opinion.

Veldheer's injury gives Alex Barron, a former first-round pick by the St. Louis Rams who has not played a game in the NFL since 2010, a shot at a starting role.

"Of course, it's an opportunity," Barron said Wednesday. "First and foremost, it's an opportunity to be here, period. It's another opportunity, obviously, to go up on the chart and help the team as best I can."

A third-round pick out of Hillsdale College in 2010, Veldheer was an emerging left tackle who was counted on as a major piece of the Raiders' rebuilding project. Veldheer was rated by Pro Football Focus as the eighth-best pass-blocking left tackle in the NFL last season.

Information from The Associated Press was used in this report.