Jayson Werth (hamstring) will not be ready for activation from the disabled list on Friday and could be sidelined for as much as two more weeks.

Nationals manager Davey Johnson said he received an "alarming" report on Werth Monday, which obviously doesn't sound good. The outfielder experienced a setback with his hamstring during a rehab game last week and has yet to return to game action. He was slated to see a specialist over the weekend and evidently didn't receive good news. Roger Bernadina and Tyler Moore will continue to be the primary fill-ins for Werth.

Jayson Werth's return from the disabled list is expected to be delayed a few days after he felt some slight tightness in his right hamstring during his first rehab game with High-A Potomac Wednesday.

Werth, who had been slated to return Saturday, is visiting with the team's specialist to get his hamstring examined. The Nationals don't seem too concerned about the minor setback, but they won't rush Werth back. "He wanted to go see another doctor in New York," manager Davey Johnson said. "Reason being, he felt a slight, little bit of tightness in his hamstring. He just wanted to check something out."

Jayson Werth (hamstring) will begin a minor league rehab assignment Wednesday with High-A Potomac.

It will be his first game action since he aggravated his hamstring on May 2. He's eligible to return on Saturday and the Nationals expect him to be ready.