Santana (back) was placed on the DL on Tuesday, Rhett Bollinger of MLB.com reports.

EDGE Analysis

Santana was initially hopeful that he'd only miss one start after experiencing back spasms, but the ailment has yet to subside. Jose Berrios and Jorge Polanco are expected to join the big league roster in place of Santana and Kyle Gibson (shoulder), but no official moves have been made yet.