The Washington Times - May 9, 2013, 12:58AM

Washington Nationals right fielder Jayson Werth will go for an MRI on his ailing right hamstring on Thursday, manager Davey Johnson said.

But the issue may be connected to a stomach virus that has seemed unrelated to this point.

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Werth, who first felt his hamstring cramp last week in Altanta, has apparently been dealing with some sort of a stomach virus for about a week now. After the Nationals rested him for four games over the course of six days, Johnson believes the issues may now be connected.

“I actually think from talking to him that he’s got some stomach virus that’s causing him to get dehydrated,” Johnson said after the Nationals’ 3-1 victory over the Tigers on Wednesday night. “When he gets dehydrated, then the muscles start spasming.”

Werth was cleared to return by his own personal doctor and he’s been testing his hamstring over the past few days without much issue, but Johnson has remained cautious in putting him back in the lineup. The right fielder does not believe he has strained the muscle because of what he’s been able to do during those physical tests and the Nationals seem convinced he does not need a disabled list stint.

But Johnson said after Werth did some running on Wednesday, he felt the cramping and that led him to believe one issue may be causing the other.

“He finished running and he started getting some muscle spasms, so he obviously was getting dehydrated,” Johnson said. “(Thursday) he’s going to see an internist and also have his hamstring MRI’d. But I have a good feeling if they can get rid of the bug, he’ll be all right.”