Setbacks in both his shoulder and his hamstring have delayed first baseman Chris Marrero’s recovery from the torn hamstring he suffered this winter, Manager Davey Johnson said. Marrero had hoped to begin playing minor league games by May, but Johnson said it could take Marrero another month or two before he can play in games.

“I think the shoulder stuff was probably coming from a lot of hitting, throwing and weight work,” Johnson said. “I’m not as concerned about some of the reports on his shoulder as I am on his leg.”

Before Marrero’s injury, which occurred during winter ball as he attempted to stretch for a ball at first base, the Nationals had counted on him as a right-handed bat off the bench.

In other rehab news, Johnson received a good report on Chien-Ming Wang after Wang threw almost 90 pitches over seven innings at Class AAA Syracuse. Wang will make at least one more rehab appearance with Syracuse before the Nationals summon him back to the majors. “He had good sink, good curveball,” Johnson said. “So he’s getting close.”

Mark DeRosa’s progress returning from a strained left oblique muscle was stunted in an odd way, Johnson said. As Bryce Harper came into the dugout Sunday night after he stole home against the Phillies, DeRosa aggravated his oblique when Harper gave him a forceful high-five.

“I don’t know if that set back the rehab or not,” Johnson said. “But I said, ‘Why didn’t use your [right] hand?’ He said it was spur of the moment.”