The Orioles will place Mateo on the 10-day injured list Thursday due to a dislocated left elbow, Paige Leckie of MLB.com reports.
Mateo suffered the injury during a collision with teammate Gunnar Henderson while attempting to make a diving play in Tuesday's 6-3 loss to the Marlins. Connor Norby, who was added to Baltimore's taxi squad Wednesday, will be recalled from Triple-A Norfolk to fill the opening in the Orioles' infield and is expected to start in Thursday's series finale in Miami.