PITTSBURGH -- Charlie Morton and the Pirates got good news from exams of the right-hander's shoulder after he left his most recent rehab start with tightness in the joint.

Morton's condition was diagnosed as tightness in the back of the shoulder, and he is tentatively scheduled to be back on the mound by next weekend.

"It's definitely good news," manager Clint Hurdle said. "Nothing more serious. We'll slow him down a bit, and hopefully resume his rehab shortly."

Morton is scheduled to play some flat-ground catch on Tuesday at PNC Park, then travel with the club for next weekend's series in New York with the Mets and throw a bullpen session in Citi Field.

"Following that, we hope to resume his rehab," said Hurdle, who qualified any perceptions that the development is a setback to Morton's comeback from Tommy John surgery.

"It isn't. Because you don't know ... you just keep moving forward and deal with what you have to deal with," Hurdle said. "It's the next challenge in his rehab. He was alarmed by what he felt, and it was proper to shut him down -- but he understands it's just something he has to push through."