Bernardino was optioned to Triple-A Worcester after Sunday's game against the Astros, Chris Cotillo of MassLive.com reports.
Bernardino allowed four runs across 1.1 innings during Sunday's loss and is being sent down in favor of a fresh arm. The left-hander has a 3.83 ERA and 1.43 WHIP with 40 strikeouts over 40 innings in 43 appearances with Boston this season and could rejoin the big club down the stretch.