Dallas Cowboys offensive lineman Nate Livings is scheduled to undergo surgery on his right knee and could miss the team's regular season opener according to the team's website. The surgery would be Livings' second surgery on the knee in six months. The 31-year-old left guard will have his knee scoped which could keep Livings sidelined for up to four weeks. The Cowboys Sept. 8 regular season opener against the Giants is just over five weeks away. Livings originally underwent surgery on the knee in February according to ESPN.com. The surgery went well enough for Livings to participate in organized team activities in May however during OTA's Livings aggravated the injury. The Cowboys were hoping that rest would be enough to heal the injury but that didn't happen. The injury is potentially bad news for the Cowboys who are already depleted at guard.