Scheppers has had the problem since the beginning of Spring Training, and he had to come out of Saturday night's game against New Orleans. Scheppers, ranked 43rd on the MLB.com list of top 50 prospects, worked two innings Saturday and allowed three runs on four hits and no walks with three strikeouts.
"After yesterday's outing, he still felt some issues in his back," Rangers assistant general manager Thad Levine said. "Rather than have him continuing to throw, we're going to take a step back and invest in a core-strengthening and flexibility routine so when he comes back, he doesn't have these maintenance issues.
"We've talked about sending him to Arizona and work on his core-strengthening routine there. There is nothing structural wrong, just a recurrence of some stiffness. We're not comfortable having him pitch through it -- we want to knock this out once and for all."
Eric Hurley is coming off the disabled list for Round Rock on Monday after being sidelined for a week with a viral infection.