Alvarez threw a 30-pitch bullpen Tuesday and used his change-up for the first time this spring, reports Jane Lee of MLB.com.
Alvarez continues to progress in his return from right shoulder surgery and experienced no issues in this bullpen session Tuesday. He has felt good in every step of his work so far this spring and has a chance to return to the A's by mid-May. Upon his return, it is assumed that he will join the rotation, either filling in for an injured starter or replacing a struggling one.