Patriots ORT Sebastian Vollmer underwent a “small procedure” on his back, according to Greg Bedard of the Boston Globe.
The procedure occurred following the 2011 season. Vollmer is expected to miss the team’s mincamp, which starts Tuesday.
The 2009 second-rounder is entering the final year of his rookie contract. After starting all 16 games in 2010, Vollmer played in only six regular-season games with five starts last season because of injuries to his back and ankle.
Vollmer had major back surgery in 2006. Marcus Cannon, a fifth-round pick in 2011, is the team’s backup at right tackle.