(Reed Saxon / AP)

Ross Detwiler will throw a bullpen session on Saturday, the final determination of if he can make his next start on Tuesday, Manager Davey Johnson said. Detwiler has progressed well from a slight oblique strain that caused him to miss his last start. The Nationals have been pleased with his improvement and believe he will be ready to pitch against the Baltimore Orioles on Tuesday in Washington.

By skipping his last day, Detwiler will have rested 11 days. Because of Thursday’s offday, Tuesday will be the first day the Nationals would need him back in order to prevent any starters from pitching on short rest.

Johnson said Detwiler played catch on Thursday afternoon and didn’t feel any pain, just tightness in his side. “He came through it all right,” Johnson said.

>>> Jayson Werth could be back by his June 3 target return date. Werth last played on May 2 and felt his hamstring tighten again when he rehabbing for Class A Potomac on May 15. Johnson said Werth will be out another two weeks after an MRI this week revealed a more significant hamstring strain than originally thought. According to Johnson, Werth could return in another week and a half.

>>> Ryan Mattheus is expected to miss two months after breaking his hand when he punched a locker following a bad outing on Sunday. Johnson said Mattheus will not require surgery and rest will be sufficient for the bone to heal.

>> Wilson Ramos has been receiving treatment on his re-strained hamstring and is progressing well, Johnson said. He landed on the disabled list on May 16 and is expected to remain on it beyond the 15 days.