Gallegos has been shuttled to the 15-day injured list with a right shoulder impingement, and he will be shut down until sometime in May at the earliest.
Edman has been shifted to the 60-day injured list while recovering from right wrist surgery, and he will remain sidelined until at least the end of May.
Middleton has hit the 15-day injured list with a right forearm strain, and he is not expected to make his season debut until at least the middle of May.
O'Brien has been designated for the 15-day injured list after undergoing surgery to repair a right flexor strain, and he is without a definitive timetable for recovery.
Hurt has been sent to the 60-day injured list with right shoulder inflammation, and he is not expected to be activated until at least the beginning of June.
Sheehan has been assigned to the 60-day injured list with right forearm inflammation, and he is not expected to be activated until at least the beginning of June.
Kershaw is expected to remain on the 60-day injured list until at least the end of July while he recovers from surgery to repair the gleno-humeral ligaments and capsule in his left shoulder.
May has been shuttled to the 60-day injured list after having surgery to repair his flexor and UCL in his right elbow, and he is not likely to suit up until the end of July.