PHOENIX – Hyun-Jin Ryu threw two simulated innings against Juan Uribe and Drew Butera and then spent some time practicing covering first base to test his strained buttock muscle. Afterward, the Dodgers said he is on track to be activated from the 15-day disabled list in the next four or five days."Everything seemed to go well," Dodgers manager Don Mattingly said. "I think everybody was happy with the way it looked. Tomorrow, if he bounces back good, we'll make a decision.