The Washington Times - May 11, 2013, 12:44AM

Washington Nationals outfielder Jayson Werth capped a frustrating week by heading to the disabled list late Friday night with what general manager Mike Rizzo termed a “very slight” hamstring strain. 

Werth has been dealing with cramping and spasming in his right hamstring for a week now and has also dealt with a stomach ailment that doctors believe is helping to cause some of the cramping because it is dehydrating him. Because his DL stint could be backdated to May 3, Werth will be eligible to return on May 18. 

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Outfielder Eury Perez was summoned from Triple-A Syracuse to take Werths’ place on the roster for the next week.

“It’s one of those things where I feel bad the team has been playing with 24 guys for over a week now,” Werth said. “We feel like we’re close and I feel like it’s really not that severe. But it’s one of those things you go out there with the way it is and you might make it severe pretty quickly. Erring on the side of caution.

“But at the same time at this point I think it’s necessary. Fortunately it’ll only be another seven days. Hopefully I can come off after the 15 days.”

Werth, who has been testing the hamstring for the past several days is hopeful he’ll go out on a rehab assignment toward mid-week when the team begins a 10-game swing through Los Angeles, San Diego and San Francisco. He and the Nationals seem confident he will be ready to turn next Saturday in San Diego.

“The most frustration thing about the whole thing is I feel pretty good,” Werth said. “I was out there running the last couple days. I’m running good. It’s just a little cramp there at times and cramps lead to bigger and worse injuries. Just being cautious and Davey is being cautious the whole time. He keeps saying he doesn’t want to lose me so I think we’re at the point we have to make the decision.”

“The thing about it for me is that I’ve never had a hamstring issue or injury or really anything. We’re kind of in unchartered waters as far as that is concerned, but at the same time there is some dehydration and some cramping issues going on.”