Peralta is behind schedule because of right shoulder stiffness. He said he expects to throw his first bullpen session of the spring next week.
But Mattingly said the pace of Peralta's throwing program is designed to take advantage of the five remaining weeks of camp. The manager said that because Peralta is primarily a one-inning reliever, he doesn't need as many exhibition appearances to be game-ready.
Ken Gurnick is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.