Detwiler has been throwing long toss as well as all of his pitches, going about his typical routine between starts. He has been working on core and stabilization exercises.
Since his arm isn't stretched out, Detwiler would have to pitch out of the bullpen upon a possible return.
"We'll take it every bullpen session and see how it is and how he bounces back," manager Davey Johnson said. "Ideally, I'd like to see him pitch in a game before the end of the year. I think that's going to be important for him mentally going forward and into next year."
Before landing on the DL, Detwiler was 2-7 with a 4.04 ERA in 13 starts over 71 1/3 innings.
"I just want to be back sometime," Detwiler said. "Every time I look at the schedule, I realize there's not many games left, so it pushes me to really want to get back out there a little sooner."
Christina De Nicola is a contributor to MLB.com.
This story was not subject to the approval of Major League Baseball or its clubs.