Patriots offensive lineman Nick Kaczur has undergone back surgery within the past seven to 10 days, the Boston Herald is reporting.
Earlier this month, Kaczur told teammates he had a significant back injury that could sideline him indefinitely and potentially threaten his 2010 season.
Kaczur, a six-year veteran, was New England's starting left guard on the first day of training camp.
New England's Kaczur Had Back Surgery