Maddon did say that it appears the ligaments in Moore's elbow were not fully torn. If that were the case, season-ending surgery would be a foregone conclusion.
Seattle announced the move after an MRI exam confirmed the original diagnosis.
Paxton left Tuesday night's win over the Angels in the sixth inning after feeling a twinge in the muscle. Paxton got the win, retiring 14 batters in a row during one stretch to improve to 2-0.