Chaparro was removed from Sunday's game against Atlanta after being struck in the head by a pitch, Mark Zuckerman of NatsJournal.com reports.
The 27-year-old picked up an RBI the hard way when he was hit in the head by a pitch with the bases loaded during the third inning, and he was eventually pulled after initially staying in the game. Chaparro is presumably being evaluated for a concussion and should be considered day-to-day.