David Robertson will be sidelined for at least another month after he visited orthopedist James Andrews on Monday for a second opinion on his sore right arm.

Andrews advised Robertson to not throw for three weeks, which could provide enough time for the relief pitcher’s flexor strain to heal without surgery. Robertson, who signed a $23 million contract this winter, has not pitched since April 14.

Gabe Kapler said he does not have a timetable for Robertson’s return. The pitcher, after not throwing for an extended period of time, would have to rebuild his arm strength. Robertson played catch during the team’s road trip but said his arm still felt stiff.

The Phillies added Robertson this offseason with hopes that he would be one of Kapler’s most trusted relievers. He had never been on the injured list with an arm injury before this season.

“David feels more comfortable with this most recent diagnosis and more confident,” Kapler said. “It was a good news visit from our perspective.”

Extra bases

Edubray Ramos was placed on the injured list with stiffness in his shoulder. Kapler said he does not expect this to be a long-term stint on the injured list. Austin Davis was recalled from triple A. … Jerad Eickhoff will start Tuesday night against Brewers righthander Brandon Woodruff.