Merrifield left Saturday's game against Seattle after taking a pitch off his helmet, Mitch Bannon of SI.com reports.
Merrifield initially stayed in the game to run the bases but was replaced by Raimel Tapia when the Blue Jays took the field. The fact that the team was leading by seven runs and inserted one of its better outfield defenders suggests that the move may have been at least somewhat tactical rather than purely injury-related.