Detwiler threw a bullpen session on Wednesday and felt fine on Thursday. Johnson was concerned that the oblique would be sore after the bullpen session, as it was the day after Detwiler's previous bullpen on Saturday.
Detwiler was placed on the 15-day disabled list on May 27, retroactive to May 16.
"I'm just trying to focus on if I feel anything or not, just to make sure if we need to take any more time off, it's just another week and not a month," Detwiler said.
Tom Schad is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.