A two-time American League All-Star, he's eligible to come off the DL this week, but that's not going to happen.
Thanks to a balky back, it probably won't happen this month.
"It [stinks], but I can only do what I can do," Duchscherer told MLB.com via text message from Arizona on Monday. "It's just wear and tear from 25 years of pitching."
A's manager Bob Geren said Duchscherer, 31, had to shut down his throwing program because of lower-back tightness, and it hasn't shown any significant improvement of late.
"Duke hasn't picked up a ball in a week," Geren said before the opener of a four-game series against the White Sox at U.S. Cellular Field.
Duchscherer, who wasn't even to the point in his program in which he was throwing off a mound, said therapists still are working on his back and that it'll be "a couple days" before he starts throwing again.
He'll need to rebuild the arm strength he's losing while sidelined before throwing off a mound, and once he gets to that point, he'll need several bullpen sessions and plenty of work in simulated games and Minor League outings before being activated.
Asked if he's hoping to return to the active roster before the All-Star break (July 13-15), Duchscherer said, "I'm not sure. I was really close before this."
Said Geren: "We don't have a timetable."
Mychael Urban is a national writer for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.