ALAMEDA, Calif. -- Oakland Raiders first-round draft pick D.J. Haydens comeback from a near-fatal practice injury last year was dealt a setback when he was hospitalized with an abdominal injury that is expected to keep him sidelined until at least training camp. Coach Dennis Allen said Tuesday at the start of Oaklands second week of OTAs that Hayden first felt symptoms last Tuesday or Wednesday. The cornerback was hospitalized late last week and had surgery to remove scar tissue from the abdominal region. The Raiders said they dont know when Hayden will be released from the hospital. Allen said he did not know if the latest injury was related to the torn blood vessel that nearly killed Hayden last November after a practice collision with a teammate at Houston. "We cant rule that out, obviously, but right now I dont know exactly what the correlation is to it," Allen said. "But we dont anticipate it being an issue." Hayden was rushed into surgery last year for a tear of the inferior vena cava, the large vein that carries blood from the lower half of the body to the heart, after the collision. Doctors had to cut through Haydens sternum to save him. The injury is 95 per cent fatal in the field, according to doctors, and is most commonly associated with high-speed motor vehicle accidents. The Raiders selected Hayden 12th overall with their first first-round pick since 2010 in hopes of adding a major piece in an effort to rebuild the defence. Hayden played 22 games at Houston, intercepting six passes that he returned for three touchdowns. He also recovered three fumbles and forced six before his senior season was cut short by the injury. Hayden made his return to the field at a three-day rookie minicamp earlier this month and also participated in part of last weeks OTA before being sidelined. "Its obviously not a good thing, from a football standpoint," Allen said. "As a rookie, you need all the reps you can get and all the work you can get." Safety Usama Young said he knew Hayden wasnt feeling good on the field last week but did not know the extent of it until Tuesday. He exchanged text messages with Hayden. "He says he is doing a lot better," Young said. "Im looking forward to him being back out there with us. It took me by surprise. I didnt think he was that sick." The other notable news Tuesday was the first practice for defensive back Charles Woodson, who signed as a free agent last week to return to the team that drafted him fourth overall in 1998. Woodson signed a one-year deal worth up to $4.3 million seven years after leaving Oakland as a free agent for Green Bay. Woodson got work at both strong and free safety in his first practice as the Raiders try to get him up to speed. "It feels good to put the silver and black back on," Woodson said. "Its been a long time. I look good in silver and black, so it feels good to be back." Woodson, 36, is an eight-time Pro Bowler and 2009 NFL Defensive Player of the Year. He has 55 career interceptions, 17 sacks, 24 forced fumbles and 11 interception returns for touchdowns in eight seasons in Oakland and seven in Green Bay. He played just seven games last year because of a broken collarbone but brings leadership and playmaking ability to a rebuilding defence that was lacking both. "Hes a legend," linebacker Nick Roach said. "Hes a living legend that is still playing, still playing at a high level. I played against him many a time when I was back in Chicago. I think its going to be great for the locker room just having that experience and having that knowledge." Woodson practiced with a jersey with no number. He wants to get his old No. 24 uniform back but cornerback Tracy Porter is currently wearing that number. "It wasnt waiting for me at my locker, so Ill have to negotiate that, for sure," Woodson said. 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The All-Pro lineman got the leg bent under him while trying to make a tackle during the first half of a 22-20 overtime loss at Miami on Thursday night. The medical staff initially thought hed torn the ligament, and the test a day later in Cincinnati confirmed it. The Commission for Conciliation, Mediation and Arbitration (CCMA) has dismissed former Dolphins coach Lance Kluseners referral over his sacking from the franchise in February, when the seasons fixtures had not been completed.The CCMA is an independent dispute resolution body, not a court of law. It looks at, among other things, unfair dismissals.Klusener had sought arbitration after his contract was not renewed, but the CCMA has now ruled in the favour of Dolphins.In the Award, the CCMA found that Klusener had failed to discharge the onus of proving a legitimate expectation of renewal of the contract existed at the time of the non-renewal, a Dolphins release said.Dolphins went trophy-less in the 2015-16 season, finishing fifth out of six teams in both the first-class and the one-day cricket, although they reached the final of the 20-over competition.When the tteam failed to match the expectations of the franchise and for that matter the public and fans, any expectation Klusener may have had of renewal, would have diminished, the release added.ddddddddddddRajesh Behari, acting CEO of Dolphins, welcomed CCMAs move and looked ahead to the upcoming season.It is relief to have this matter now resolved, and we can focus all our energies on the upcoming season, he said. 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