According to Karen Kuregian of the Boston Herald, Brady first "dinged" his shoulder in New England's October 1 game against the Carolina Panthers.
They also indicated that the injury wouldn't keep him from practicing or playing against the Jets this week and Brady was on the practice field for the portion of Wednesday's workout that was open to the media. The good news is that the injury is in his left shoulder - not his throwing shoulder.
Brady says he'll be on the field Sunday to play the New York Jets in a fight for first place in the AFC East. The 16 sacks are more than his total for the entire 2016 season. Against the Buccaneers on Thursday night, he was sacked three times and hit six times.
Aside from when Brady missed almost the entire 2008 season due to an ACL and MCL tear in Week 1 against the Chiefs, he has been remarkably durable.
He's also been sacked 16 times, more than in all 12 games he played in previous year. It's only Tuesday and giving a 40-year-old quarterback a day off doesn't seem like the worst idea.