Whisenhunt is slated to start Friday's game against the Padres in San Diego.
Whisenhunt will receive a second turn through the rotation after he took the loss last Sunday against the Angels, striking out seven and allowing four earned runs on five hits and two walks over five innings. With Trevor McDonald (elbow) and Hayden Birdsong (elbow) done for the season and Robbie Ray and Tyler Mahle both candidates to be dealt ahead of Monday's trade deadline, Whisenhunt should have a fairly clear path to sticking around in the rotation.