The move is retroactive to Saturday. Davis left Friday night's game against Kansas City after four innings and has not played since.
Baltimore did not make a move Sunday to fill the roster spot. The Orioles are off Monday, and manager Buck Showalter said the team will fill out the 25-man roster before Tuesday's game against Pittsburgh.
Davis led the majors last year with 53 homers and 138 RBIs. This season he has two home runs and 13 RBIs in 22 games.
Showalter says Davis told him that he's a faster healer. Showalter noted that ''the normal time on these things is more than the DL period.''