PHOENIX -- Dodgers pitcher Hyun-Jin Ryu said he felt no pain throwing a bullpen session at moderate intensity on Tuesday and will face hitters on Wednesday to help determine when he comes off the disabled list.
Manager Don Mattingly said Ryu, out with a strained right gluteus muscle, could return to the rotation as early as Sunday. The left-hander is eligible to be activated Friday, but Mattingly said Dan Haren will pitch Friday and Zack Greinke will pitch on Saturday.
Ryu wouldn't speculate when he would be able to return. Rosters expand on Monday, when it won't be necessary to move a player to make room for Ryu's return. Mattingly said the roster move is part of the decision.
Ryu has allowed only one run in 19 innings this year to the Padres, Sunday's opponent. He hasn't faced the Nationals, Monday's opponent, this year.
Following Ryu to the bullpen mound Tuesday was Paco Rodriguez, still rehabbing from a teres major strain near his shoulder. It was the left-handed reliever's third bullpen session and he's throwing at about 70 percent effort.
Ken Gurnick is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.