The Biscuits are holding reliever Neal Frontz out for a week because of soreness in the right-hander's elbow. Frontz said it started hurting during Montgomery's series at Mississippi that ended last week.
"I thought it was normal, but it wasn't," he said. "This is more of a precaution than anything. I'll give it a rest and see how it feels."
Frontz has a 5.29 ERA in 43 appearances after giving up four runs in an inning Monday.