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Mountcastle is being evaluated for a concussion following his removal from Friday's game against the Rays, Nathan Ruiz of The Baltimore Sun reports.

Mountcastle took a hard tag to the side of the head while attempting to steal second base in the first inning Friday. Although he initially stayed in the game, the 24-year-old was removed in the third inning under the league's concussion protocols. If team doctors confirm a concussion, Mountcastle will need to pass several tests before he's cleared to return.

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