Updated 12:19 p.m. ET, Sept. 10, 2011

Injuries continue to plague the Giants, as MLB Jonathan Goff will miss the entire 2011 season with a torn ACL. He was placed on injured reserve on Saturday.

Per multiple reports, Goff suffered the injury in a collision with a teammate in Monday's practice.

Goff, a fourth-year veteran, started all 16 games last season. He made 80 tackles, one sack and two passes defensed.

DE Justin Trattou was signed from the team's practice squad to replace Goff on the active roster.

The Giants have already lost CB Terrell Thomas and DT Marvin Austin for the season. First-round CB Prince Amukamara continues to nurse an injured foot.

The way we see it

This is a big loss for the Giants even though Goff is primarily a run stopper. Mitchell may be a stopgap, but this will also push one of the rookie linebackers up the depth chart as well, starting with Greg Jones. Expect to see a lot of three-safety defenses that they used as their base last year.