Left-hander Danny Duffy became the second starter to go on the disabled list on Monday and, pending a second medical opinion, he seems headed for Tommy John surgery on his elbow. Left-hander Jonathan Sanchez is also out with left biceps tendinitis.
Duffy's next start would have been on Friday night during Interleague Play against the D-backs at Kauffman Stadium. Now either Luis Mendoza or Nate Adcock will fill that spot.
Mendoza replaced Duffy in the first inning on Sunday and earned the 9-1 victory over the White Sox. He began the season in the rotation and has a 2-2 record and 4.76 ERA. Adcock, recalled after just two days on the Triple-A Omaha roster, had served as the long man out of the bullpen.
The other current starters are Bruce Chen, Luke Hochevar and Felipe Paulino.