Peralta will take the mound for the first time in a month after experiencing shoulder stiffness during workouts in the Dominican Republic to prepare for Spring Training. Peralta changed his normal offseason routine of playing winter ball in hopes of assuring he would report to Spring Training healthy.
Rain is forecast for Monday, but Mattingly said pitchers will throw off the mounds in the covered batting cages.
Mike Bolsinger felt a groin muscle twinge in the first inning of throwing batting practice and was shut down for precautionary measures. He will be re-evaluated Monday.
Ken Gurnick is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.