Mark Kotsay: Out With Stiff Lower Back

Center fielder Mark Kotsay, out since Feb. 26 with lower back stiffness, underwent an MRI Wednesday and is unlikely to play this weekend. With Bobby Kielty already scheduled to have left knee surgery, Kotsay's back problems further weaken Oakland's outfield depth. While the two are out, Milton Bradley will take over in center, Nick Swisher will move to right and Shannon Stewart will have even more job security in left, resulting in an opening for Dan Johnson at first base.
Source: MLB.com