From Tom Silverstein:

Practice started with all 53 players present and working in pads Thursday afternoon, but before individual drills were over RT Bryan Bulaga was on the sideline with an apparent left knee injury.

Bulaga took part in most of the drills and didn't step off to the side until late in the part of practice open to the media. He stood on the sideline as a trainer talked with him and then removed his left knee brace.

The veteran appeared to be in some discomfort, but it's not clear whether he was able to return or was taken to the training room. Bulaga tore the ACL in his left knee during training camp in 2013 and has worn a heavy brace to protect it ever since.

Needless to say, losing Bulaga prior to the Seahawks game would be a monster blow. The Packers offense was severely limited last year when the veteran tackle was hurt in their Week 1 matchup and having to face Michael Bennett and Seattle's pass rush with any of the current backups would be less than ideal. 

Don Barclay said he finished practice at right tackle today in place of the injured Bryan Bulaga.

— Michael Cohen (@Michael_Cohen13) September 17, 2015