Who will step up at left guard?

Nick Kaczur is dealing with a significant back injury that could sideline him indefinitely, which means the Patriots' remaining personnel at left guard will be put to the test.

Kaczur was the projected replacement for Logan Mankins, who has not reported to camp in a contract dispute.

Here is one opinion as to how the left guard depth chart now looks without Mankins and Kaczur:

Dan Connolly (5th year) -- The 6-foot-4, 313-pound Connolly has appeared in 19 career games with four starts (all coming last year at right guard). He originally joined the Patriots as a practice squad player in 2007.

Ryan Wendell (2nd year) -- A bit undersized at 6-foot-2, 290 pounds, Wendell joined the Patriots as a rookie free agent in 2008 and spent most of the last two seasons on the practice squad. He has appeared in two regular-season games as a reserve and as part of the wedge on the kickoff return unit.

Rich Ohrnberger (2nd year) -- The Patriots made an aggressive move to select Ohrnberger (6-2, 300) in the fourth round of the 2009 draft, dealing veteran cornerback Ellis Hobbs for two fifth-round draft choices, and then trading the two fifth-rounders to move up a round for Ohrnberger. He appeared in three games as a rookie, either as a reserve or on special teams.

Ted Larsen (rookie) -- A sixth-round draft choice out of N.C. State, Larsen (6-2, 305) was moved from defensive tackle to center in his junior season in 2008. He has lined up at center and guard in training camp practices.

Eric Ghiaciuc (6th year) -- The 6-foot-4, 303-pound Ghiaciuc was signed to a one-year deal on Wednesday. He played in 48 games (42 starts) for the Bengals from 2005-2008, and was out of football in 2009 until the Chargers signed him late in the season, although he did not appear in a game for San Diego.