The Orioles selected Tromp's contract from Triple-A Norfolk on Monday. He'll start at catcher and bat ninth in the Orioles' series opener versus the Rangers.
With Adley Rutschman (oblique) and Maverick Handley (concussion) on the injured list, Tromp will serve as the Orioles' backup catcher behind Gary Sanchez. Tromp is a career .219/.229/.375 hitter over parts of six major-league seasons.