On Aug. 6, ESPNBoston.com first reported that, according to an NFL source, Kaczur told teammates he has a significant back injury that could sideline him indefinitely and potentially threaten his 2010 season.
Kaczur, a six-year veteran, was the Patriots' starting left guard on the first day of training camp. He went through the team's first three practices before being knocked out with the back injury.
Kaczur's role was one of the top storylines for the team because Logan Mankins, the Patriots' starting left guard the past five seasons, remained out of camp in a contract dispute.
With Mankins yet to report and Kaczur sidelined, the Patriots have turned to five-year veteran Dan Connolly at left guard. While few would argue that the Patriots aren't hurt by the absence of Mankins -- a two-time Pro Bowler and one of the toughest, most durable players on the team -- the club hasn't missed a beat through two preseason games. Connolly delivered a key block on BenJarvus Green-Ellis' 6-yard touchdown run in the preseason opening win over the New Orleans Saints.
Mike Reiss covers the New England Patriots for ESPNBoston.com.