Add Mike Iupati to the list of 49ers who had surgery this offseason. The team's All-Pro and Pro-Bowl left guard had a procedure on his shoulder and is unlikely to take part in the team's upcoming OTA sessions, according to a source with knowledge of the injury.

Iupati started every game of the 2012 season and played 98 percent of the 49ers' offensive snaps. Beginning in Week 14, he was one of several 49ers who began appearing on the team's injury report with a shoulder injury. He was listed as 'probable' from that point through the Super Bowl. Iupati apparently injured the joint in a Week 13 win against the Dolphins.

The exact nature of the injury is unknown, but it is considered minor and Iupati is expected to be back at full strength for the start of training camp. Iupati also had shoulder surgery after his 2007 season at the University of Idaho.

Earlier this year, the 49ers gave starting right tackle Anthony Davis a five-year, $37 million contract extension. Iupati, who like Davis was a first-round pick in 2010, is believed to be next on the 49ers' contract to-do list, although that deal may not be done until after the 2013 season.

The 49ers on Monday signed veteran offensive lineman Adam Snyder to a two-year deal. He is a candidate to fill in for Iupati in this month's OTAs, as are promising interior linemen Daniel Kilgore and Joe Looney, neither of whom have much in-game experience.