Packers' offseason roster review: Bryan Bulaga's return keeps offensive line intact

GREEN BAY, Wis. -- This is the fifth in a series looking at the Green Bay Packers' offseason roster by position as they head into organized team activity practices later this week.

Previous installments: Quarterbacks, running backs, receivers, tight ends.

Next up: Offensive line.

Who they added: G Matt Rotheram (undrafted rookie), G Marcus Reed (undrafted rookie), G/C Andy Phillips (undrafted rookie), T Fabbians Ebbele (undrafted rookie).

Who's gone: T Aaron Adams.

Key holdovers: T Bryan Bulaga, T David Bakhtiari, G T.J. Lang, G Josh Sitton, C Corey Linsley, C/G JC Tretter, G Lane Taylor, T/G Don Barclay, C Garth Gerhart.

Roster spots likely available: 8 or 9.

Competition: With the return of Bulaga, who signed a five-year, $33.75 million contract in March, the entire starting offensive line returns from last season. That group started together in 17 of the 18 games (including playoffs), which means there is not likely to be any starting jobs open. That includes center, where Linsley played so well after Tretter injured his knee in the preseason that he kept the job even after Tretter returned. The most highly touted of the Packers' undrafted free agent linemen is Rotheram, who started 38 games over his final three seasons at Pittsburgh. He could challenge Taylor, who was been a backup the past two seasons, for a roster spot.

Notable: The entire starting group is under contract through at least the 2016 season. That’s when the contracts for Lang, Sitton and Bakhtiari expire. Linsley is signed through 2017 and Bulaga through 2019. ... This was the first time in GM Ted Thompson's tenure, which dates to 2005, that he did not select an offensive lineman in the draft.