Alvarez (shoulder) was placed on the 15-day disabled list on Saturday.
Alvarez has been long expected to start the season on the disabled list due to his lengthy recovery from shoulder surgery, and the A's finalized the move Saturday with Opening Day looming. However, Alvarez has been upping his pitch counts during recent bullpen sessions and is scheduled to face live hitters Wednesday. If he continues to recover at this pace, he could be back on the mound some time in mid-May.