NAPA, Calif. -- The Oakland Raiders sustained a significant blow Wednesday with the news that starting left tackle Jared Veldheer will need surgery on his torn left triceps and will miss a significant portion of the upcoming season. Veldheer has been bothered by the triceps throughout training camp and had a second MRI performed on Tuesday when it did not feel any better. After consulting with doctors and the team, Veldheer decided to have the surgery. "Its a disappointment for all of us," coach Dennis Allen said. "But again were going to play 16 games this year. The teams that are able to push through those things mentally, those are the teams that have success. Everybody has injuries. Thats one well just have to deal with." Allen said Veldheer would miss a significant amount of time but hoped he would be back at some point this season. Allen said Veldheer would be a candidate to be placed on injured reserve with a designation to return, which would require him to miss at least the first eight weeks. The Raiders can place Veldheer on that list starting Sept. 3. He would be required to sit for six weeks and then could practice for two more before being eligible to be activated in time for the teams eighth game on Nov. 3 against Philadelphia. Teams can only use that designation on one player and Allen said he wouldnt know for sure whether that would be an option for Veldheer until after the surgery. The injury to Veldheer gives a shot at a starting role to Alex Barron, a former first-round pick by the St. Louis Rams who has not played a game in the NFL since 2010. "Of course its an opportunity," Barron said. "First and foremost its an opportunity to be here, period. Its another opportunity obviously to go up on the chart and help the team as best I can. My whole thing is Im going to continue to work and try to help the team as best I can." Barron was drafted 19th overall in 2005 out of Florida State but struggled for almost his entire five seasons in St. Louis. He started 74 games and played both left and right tackle but was plagued by penalties and poor blocking. He committed 43 false start penalties -- including 13 in 2006 -- and 13 holding penalties while allowing 33 sacks, according to game tracking from STATS LLC. He was traded to Dallas in 2010 and played 11 games with the Cowboys. But Barron hasnt played since, spending a little time with New Orleans and Seattle without ever getting into a game. "I think Alex has been playing very well," quarterback Matt Flynn said. "I was with him in camp last year in Seattle. He seems like a different guy here. Hes playing well, playing aggressive and really coming into his own." Veldheer was perhaps Oaklands most indispensable player, given his talent and the importance of the position he plays. He had started the past 42 games at left tackle, missing only one offensive snap in that entire time. A third-round pick out of Hillsdale College in 2010, Veldheer was an emerging left tackle in the NFL 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. He has been responsible for just four sacks in each of the past two seasons, according to STATS LLC. "Its a real big blow," right tackle Khalif Barnes said. "Jareds a big part of our line. Hes a big guy. He comes to work every day, you never hear him complaining, just tries to go in, get the job done, he just tries to perfect his craft every day at practice. Hes a good part of our team, a good leader for our team." The Raiders have been hampered by injuries on the line throughout camp. Right guard Mike Brisiel has been out all week as he struggles to recover from off-season ankle surgery. Lucas Nix, who is batting with Tony Bergstrom for the left guard spot, has also missed significant time in camp with an undisclosed injury. Second-round pick Menelik Watson has not practiced all camp with a calf injury. With Oakland changing blocking schemes from a zone system last year to more power blocking this season, the lack of continuity on the line is concerning. "It definitely hurts," centre Stefen Wisniewski said. "Weve had a couple of left guards in there, a couple of right guards in there, and now were working with a new left tackle. But I think were all communicating really well. I think its just a matter of getting your footwork right, and getting some of those combination blocks right." John Riggins Jersey . 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While hell be dialed in to that tournament on a course he loves, you can forgive him if his eyes glance down the calendar just a bit, towards April. CAMBRIDGE, Ontario -- Chella Choi ended up on top of the LPGA Manulife Classic leaderboard Thursday at windy Whistle Bear when Belen Mozo unraveled with a closing triple bogey.Choi shot a 6-under 66, finishing with a birdie on the par-5 ninth.Pretty good. Pretty good, said Choi, the South Korean player who won the Marathon Classic winner last year for her first LPGA Tour title. A lot of wind, but my game is good and driving is good, shot was good, so I made a lot of birdies.Mozo was 7 under before running into trouble on the par-4 18th. The wind took her drive wide right into thick rough. She hacked her way out, found two bunkers and finally putted out for a 68. The Spaniard was in a late group and apologized to reporters as she rushed to the driving range before it closed for the day.Second-ranked Ariya Jutanugarn was four strokes back after a 70 in her bid to win three straight events for the second time this season. The 20-year-old Thai player began her latest streak at the Womens British Open, and rebounded from a knee injury that forced her to withdraw during the Rio Olympics to win the Canadian Pacific Womens Open on Sunday in Alberta.Using a driver in competition for the first time since May, she dropped two strokes on the back nine after birdieing the first three holes and making the turn in 4 under.U.S. Open champion Brittany Lang, second last year at Whistle Bear after winning the inaugural event in 2012 at Grey Silo, was a stroke back at 67 along with South Koreas In Gee Chun, Spains Azahara Munoz and Swedens Dani Holmqvist. Lang holed a lob wedge for eagle on the par-5 third -- her 12th hole.The course was playing a little bit tricky with the wind and couldnt get to that par 5, Lang said. I actually laid it up a little bit too far left and through. I was like, `Awe, should still be OK. And then when I hit it, it was nice and high and on the right line. And we couldnt see it. And then my husband and all our friends were up there, and they were screaming, so it was a pretty cool reaction.Munoz noted the tournaments later dates after her bogey-free round.ddddddddddddI think its nicer playing now than in June, Munoz said. I think last year was a little cooler the first few days. The course is great. The greens roll really nice, so if you hit a good putt, the ball goes in.Top-ranked Lydia Ko had a 70. The 19-year-old New Zealander has four LPGA Tour victories this year.Defending champion Suzann Pettersen shot a 69 in the group with Ko and Stacy Lewis (70). Pettersen won at 22 under last season in the first year at Whistle Bear after three at Grey Silo.Jutanugarn played alongside 18-year-oldCanadian star Brooke Henderson matched Jutanugarn with a 70 in their afternoon group.The wind really picked up on the back nine. It was kind of difficult, the 18-year-old Henderson said. You could see all three of us not really playing exactly the way we wanted just because of the wind and the conditions. But I finished 2 under on afternoon tee time in windy conditions. Im happy. Im just excited to tee it up tomorrow where conditions will be a little bit softer and not as much wind.Henderson, from Smith Falls in southeastern Ontario, beat Ko in a playoff in June in the KPMG Womens PGA for her first major title, and successfully defended her Portland Classic title in early July.Choi has concentrated on improving her driving. She hit 10 of 14 fairways Thursday.I worked really hard the last three weeks, Choi said. I want to hit straight and strong my drive four days, so I focus on just my driving four days.DIVOTS: Alena Sharp and Maude-Aimee Leblanc topped the Canadians at 69. Sharp, from Hamilton, is coming off a career-best fourth-place finish in Alberta. Lorie Kane had a 70. The 51-year-old Kane was inducted into the Canadian Golf Hall of Fame last week. ... Michelle Wie birdied the 18th for a 72. She has missed 11 of 19 cuts this season and is 112th on the money list with $55,375.