Orioles general manager Mike Elias said Tuesday that Mountcastle (wrist) is expected to begin a rehab assignment by the end of the week and could return from the 10-day injured list before the end of the regular season, Jacob Calvin Meyer of The Baltimore Sun reports.
The 27-year-old has been sidelined since Aug. 22 due to a sprained left wrist, but he's on the cusp of returning to game action. The Orioles begin their final road trip of the regular season next Tuesday against the Yankees, and Mountcastle should rejoin the big club at some point during that six-game stretch after getting some at-bats in the minors.