Update: According to reports, Bennett was dealing with a hamstring tear. Tear could insinuate either a grade 2 (partial tear) & Grade 3 (complete tear). Grade 2 is usually non surgical, 3 would require surgery. 6-10 weeks RTP.
Patriots to placed TE Martellus Bennett on the IR, likely secondary to a combination of hamstring and shoulder injuries. It appears that he has a rotator cuff injury, and the most common rotator cuff injury is a supraspinatus muscle tear. This is the most important and strongest muscle in the rotator cuff. If he indeed does need surgery he will likely be out at least six months, and possibly up to nine months. Shoulder injuries, as we have seen with Andrew luck, can be very challenging to return from, the good news is that he is a receiver and not a quarterback. This is a similar injury that Cam Newton was dealing with.