Musgrove has been sent to the 15-day injured list with right triceps tendinitis, and it is unknown if he will be activated prior to Sunday's matchup with the Braves.
Marcano has hit the 10-day injured list while recovering from surgery to repair a torn right ACL. Team officials have not yet confirmed an exact return date.
Junis has wound up on the 60-day injured list with a right shoulder impingement, and he is expected to remain sidelined until at least the early part of June.
Miley has hit the 60-day injured list with left elbow inflammation, and he will miss the remainder of the season while recovering from Tommy John surgery.