(Alex Brandon / AP)

Jayson Werth tested his strained right hamstring during two complete workouts this afternoon, one by himself and one with the rest of the Nationals during batting practice. Werth is scheduled to go on a rehab assignment Wednesday, Manager Davey Johnson confirmed after Tuesday’s 9-3 win over the Orioles.

Werth went through his most extensive workout yet this afternoon, but the Nationals have been confounded by Werth’s injury. He has not played since May 2, and he already tried to go on one rehab assignment at Class A Potomac. Before Tuesday’s game, Johnson still didn’t know when Werth could return to the Nationals.

“I heard one minute, it was ‘I’ll meet you in Atlanta [on Friday]’ ” Johnson said. “The next minute, ‘When you come back [to Washington on Monday].’ I’m not really sure where we’re at. But he’s trying to get ready.”

At around 3:30 Tuesday afternoon, Werth started to work out with a few trainers and hitting coach Rick Eckstein. He went through some light running drills in shallow right field. He stood at the plate and swung for about 20 minutes, taking full, aggressive swings at short tosses from Eckstein. He blasted several balls over and off the fence.

Werth sprinted around the bases a few times. He finished the solo workout by taking a swing through the air, dropping his bat and exploding out of the batter’s box, the motion that aggravated his hamstring.

After a short break, Werth stretched with the rest of the Nationals, shagged flies in the outfield and took another round of normal batting practice. He seemed to come through the activity with no ill effects. Werth declined comment afterward.