Pepiot was placed on the 15-day injured list Thursday with a left oblique strain, Juan Toribio of MLB.com reports.
Pepiot had been lined up as the fill-in starter with Tony Gonsolin (ankle) sidelined to begin the season, but that assignment will now go to Michael Grove instead. The recovery time for an oblique strain can range from a couple of weeks to multiple months, and there's no word yet from the Dodgers about a Pepiot's recovery timetable.