Palumbo (back) is expected to pitch in relief behind starter Jordan Lyles in Tuesday's Cactus League game against the Angels.
Palumbo looks to have moved past his bout with the back spasms that have prevented him from pitching in a spring game since March 4. Unless the Rangers elect to place him on the 10-day IL rather than optioning him, the 26-year-old lefty is expected to open the season as a member of the Triple-A Round Rock rotation.