Hyun-Jin Ryu threw a bullpen session Monday in preparation for his Thursday night spring debut against the Padres.
Mattingly also said injuries to utilitymen Darnell Sweeney and Alex Guerrero are minor. Sweeney injured his left shoulder in a collision at first base, and Guerrero tweaked his left hand while batting. But Sweeney made the trip to Scottsdale, Ariz., on Monday, and Guerrero was expected to work out at Camelback Ranch.
Joel Peralta is scheduled to face hitters on Tuesday, and he could make his first game appearance by Sunday. Late signee Mike Adams is on a schedule, one day behind Peralta.
Mattingly also said the club decided against using a "B" game to provide more innings for pitchers, who instead will throw extra sessions in the bullpen after their game appearances.
Ken Gurnick is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.