Scott Olsen suffers injury setback

Starter Scott Olsen hit a setback in his return from the disabled list and, while a timetable for his return to the Nationals' rotation is unknown, he will not return until well after he is eligible to come off the disabled list.

Olsen went on the disabled list May 22 after leaving a start with tightness in his surgically repaired left shoulder. He threw 33 pitches in a bullpen session in Houston last week, and the Nationals began targeting a date for him to make a rehab start in the minor leagues.

When Olsen - who is 2-2 with a 3.77 ERA in eight starts - tried to throw the day after his mound session, he felt weakness in his shoulder.

"It's just not really feeling as good as he had hoped," Manager Jim Riggleman said. "He was really making progress. He was really excited about basically coming off the disabled list at the time it was time. The last couple times he went out and threw, he said, 'You know what? I just don't feel right.' "

Olsen will play catch Monday, virtually restarting the process of bringing his arm back to strength. When he does exercises for flexibility and strengthening, he feels no pain.

"I'm not any more concerned than I was a month ago," Olsen said. "I don't know how it's going to react."