Detwiler has been on the disabled list since July 7 with a herniated disc in his back. Doctors prescribed a month of rest, which has now passed, as well as anti-inflammatory medicine. Manager Davey Johnson said that he wanted to see how Detwiler's back responded to the running before proceeding.
Johnson also said that Ross Ohlendorf threw a side bullpen session on Tuesday and will make a second Minor League rehab start on either Thursday or Friday. Ohlendorf pitched three innings at Triple-Syracuse on Saturday, but Johnson said the right-hander would need one more rehab start before returning to the Nationals.
Ohlendorf will throw between 50 and 60 pitches in his upcoming appearance, Johnson said. Barring any setbacks, the hurler will likely replace Taylor Jordan, who will soon hit his team-imposed innings limit, as the Nationals' fifth starter.
Tom Schad is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.