Gasper is not in the lineup for Saturday's game against the Mariners, Chris Cotillo of MassLive.com reports.
Gasper has taken over as the No. 1 option in Boston's catching trio and is even seeing regular run in the leadoff spot, but he will get a night off after three consecutive starts. Newcomer Anthony Seigler will lead off Saturday while Carlos Narvaez catches for rookie Connelly Early.