Bulaga suffered a torn ACL during Saturday's Family Night scrimmage, according to Pro Football Talk.
The Milwaukee Journal-Sentinel reported earlier that the Packers feared Bulaga suffered a "significant" knee injury.
Bulaga, the team's 1st round draft choice in 2010, missed the second half of the 2012 season with a serious hip injury. He returned this off-season healthy and ready to man the left tackle position.
Now, it appears Green Bay may need to shuffle Marshall Newhouse from right tackle back to the left side.
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