Athletics righty Jarrod Parker will undergo an unspecified surgical procedure on his right elbow tomorrow, the club announced. Parker, who was in the midst of rehabbing from his second Tommy John surgery, was diagnosed recently with a fractured medial epicondyle.

On the positive side, it appears that Parker will not require another UCL replacement, per a tweet from Susan Slusser of the San Francisco Chronicle. Rather, he’ll be going under the knife to “stabilize” the fracture.

Needless to say, the overall situation is terribly disappointing for both Parker and the A’s. The former ninth overall pick owns a 3.68 ERA over 384 total big league innings, all logged before he even reached his age-25 season. But that’s approximately where the good news ended, as Parker — now 26, has not thrown in the big leagues in either of the last two seasons.

At this point, there is at least some possibility that Parker will be a non-tender candidate. He is arb-eligible for two more seasons after this one, giving additional cause for Oakland to try to bring him back to health. Then, there’s the fact that the A’s defeated Parker in an arbitration hearing over the winter, leaving him with a $850K salary that would very likely be repeated next year — hardly a significant investment. Of course, the prognosis and timetable, which will presumably drive the decisionmaking, remain unreported.