Alexander has been activated from a 15-day injury after recovering from stress reaction in his left rib, and he is expected to play against the Rockies on Tuesday.
Tarnok has been sent to the 60-day injured list while recovering from right hip surgery, and he will be out of commission until at least the end of May.
Waldichuk has been posted to the 60-day injured list while recovering from surgery to repair the UCL and flexor in his left elbow. He is not expected to make his season debut until the latter part of May.
LeMahieu has hit the 10-day injured list with a right foot non-displaced bone fracture. He has suffered a setback in recovery and remains without a timetable for return.
Trivino has been sent to the 60-day injured list after undergoing Tommy John surgery on his right elbow, and he is not expected to be available until the middle of July.
Dominguez is on the 60-day injured list after having Tommy John surgery on his right elbow, and he is not expected to make his season debut until the middle of July.