When the Green Bay Packers released former first round draft choice Derek Sherrod on Monday, concern developed about the depth on the team's offensive line.

J.C. Tretter was activated from short-term injured reserve to take Sherrod's place on the roster, and perhaps suprisingly was listed as the team's backup left tackle on the Packers' newly released depth chart on Tuesday, albeit one that's merely for media purposes and not official.

Prior to coming off injured reserve, Tretter had only played center in a Packers uniform. He was the starting center in the Packers' first three preseason games in 2014, playing 86 snaps, before suffering a fracture in his knee.

Fifth round draft choice Corey Linsley has ably handled the center position in Tretter's stead and doesn't figure to be displaced in the starting lineup, although Tretter is also listed as the team's backup center.

Tretter does have experience at left tackle, having played the position his final two seasons of college at Cornell.

At 6-4 and 307 lbs., Tretter is slightly undersized compared to the average NFL tackle.

The Packers' backup at right tackle on the new depth chart has also changed with T.J. Lang listed behind Bryan Bulaga.

Lang played right tackle earlier in his career before settling in as a regular at guard.

Garth Gerhart is also listed as the backup at top backup at left guard after previously being listed as the No. 2 center earlier in the season.