The Diamondbacks placed Sewald (oblique) on the 15-day injured list Thursday.
Sewald is eligible to return from the IL on April 9, but given that he was diagnosed earlier this week with a Grade 2 left oblique strain, he'll most likely be sidelined well beyond the 15-day minimum. In Sewald's absence, the Diamondbacks are likely to turn over closing duties to Kevin Ginkel.