Patriots offensive tackle Sebastian Vollmer had a "small procedure" on his back this offseason, according to Greg A. Bedard of the Boston Globe. Vollmer missed the three organized team activities open to reporters over recent weeks, and is not expected to practice during the team's minicamp this week.
The 27-year old Vollmer enters the final season of his contract with the Patriots. Last season, back and ankle injuries limited him to six games, although he was able to return to the field for Super Bowl XLVI after missing two months. The ankle injury, which kept him out of organized team activities, also required surgery last season, Bedard previously reported.
Vollmer is expected to be ready for the start of training camp in late July.
In addition to Vollmer, the Patriots have a number of players dealing with injuries heading into this week's mandatory minicamp. Here's a snapshot look at where each player stands:
LOGAN MANKINS -- Mankins continues to recover from ACL surgery conducted after the 2011 season. While his timetable remains a little bit unclear -- Mankins missed all organized team activities open to the media -- he has expressed a desire to return for training camp.
ROB GRONKOWSKI -- Gronkowski missed organized team activities open to the media as he recovers from offseason ankle surgery. However, Gronkowski has not walked with any limp in recent public appearances, and was on the sidelines rehabbing during OTAs.
AARON HERNANDEZ -- Hernandez missed the final organized team activity open to the media, after practicing in the first two. It is not known what caused Hernandez to miss that practice.
BRANDON SPIKES -- Spikes dealt with a right knee injury during the latter portion of the 2011 season, and had surgery to address the issue earlier this offseason. He missed all OTAs open to reporters, but was spotted at times doing rehab with trainers.
BRANDON DEADERICK -- Deaderick missed the final organized team activity open to the media, after practicing in the first two. It is not known what caused Deaderick to miss that practice.
DANIEL FELLS -- Fells was not been spotted at all during OTAs open to reporters, and the Boston Herald reported he is dealing with a minor injury issue. With the tight end position thinned by injuries, Fells remains a player to monitor.
MYRON PRYOR -- Pryor was not spotted during three weeks of OTAs, and spent much of the 2011 season on injured reserve after suffering a shoulder injury. There’s been no official word on his absence, although it seems probable that Pryor may still be recovering from that injury.
MATTHEW SLATER -- Slater has been working on the sidelines with members of the Patriots training staff during OTAs, although in the final practice open to the media, Slater seemed in good spirits, spending a kickoff drill at the end of practice mingling with and instructing his teammates. Slater also had his helmet on the field with him during the final OTA open to reporters.
TRACY WHITE -- White is reportedly recovering from sports hernia surgery, although he is expected back on the field for training camp, according to the Boston Herald. He was spotted doing rehab on the sidelines during organized team activities, but did not practice. During the final OTA open to reporters, White brought his helmet with him onto the field, a sign that he may be close to returning.
MARKUS ZUSEVICS -- Zusevics, an undrafted rookie from Iowa, made headlines during the NFL Combine when he suffered a torn pectoral muscle on the bench press. He did not participate in OTAs, although he was spotted on the field with his teammates as an onlooker.