Orioles manager Brandon Hyde said Mateo is going through the concussion protocol after exiting Sunday's game versus the Rays, Jake Rill of MLB.com reports.
Advice: Mateo was struck in the head by the bat of teammate Cedric Mullins around the on-deck circle and was subsequently removed from the contest. It remains to be seen if Mateo will miss additional time, and he should be considered day-to-day as he continues to be evaluated.
Rotowire.com
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