The Nationals were hopeful Werth would have come off the disabled list this week, but his delay was because he visited with a specialist in New York.

"They worked the hamstring very well," Rizzo said. "They found out how they wanted to work it. In doing all that work on it, they flared it up. Hopefully, it’ll make it better in the long run. But they flared it up so he didn’t want to play the next day in the minor leagues. We’re having him rest today, and he’ll start ramping up baseball activities this week."

Werth is seeing a specialist in Chicago to determine what is wrong with the hamstring. He has been out since May 2 with the injury, and this is the second specialist he is seeing this weekend. 

Werth saw a doctor Thursday after feeling tightness in his strained right hamstring, and is in New York visiting with the team's specialist, according to the Washington Times.

"He wanted to go see another doctor in New York," manager Davey Johnson said Thursday. "Reason being, he felt a slight, little bit of tightness in his hamstring. He just wanted to check something out."

The team has yet to say officially, but it looks like Werth's return to the active roster could be delayed a few days. Werth has been out since May 2 due to this injury. 

Werth said his hamstring feels fine, but he "needed more action." There's a 40 percent chance of rain near game time, and the Nationals might not like their highly paid outfielder playing a rehab game in poor weather. The Potomac Nationals are located just a half hour from Nationals Park, so Werth could be getting his work in with the major-league club Thursday. He is aiming to return to the Nationals Saturday.