Wuertz warmed up in the bullpen, and then pitched a simulated game off the Oakland Coliseum mound with outfielder Ryan Sweeney taking cuts.
"It went good," Wuertz said before the A's game against Detroit. "I felt good. I mean a little rusty, obviously. I haven't thrown off the mound once since that Opening Night, but overall I feel good. The most important thing was just testing the hamstring out, and it came out good. Fortunately, when I throw off the mound, it doesn't really bother me. We're making progress."
Barring a setback, Wuertz expects to go on a Minor League rehab assignment as early as Saturday.
Wuertz pitched a scoreless inning on Opening Night against Seattle, striking out two, but the next day he injured himself in the weight room. He went on the 15-day DL on April 6, retroactive to April 2.
"[I] just kind of tweaked it," Wuertz said. "[I] thought it might get better, but I guess I did a little more to it than I thought. It was sort of one of those fluke things. It's kind of tough sitting here, coming back from Toronto and sitting here watching our games, knowing that if this wouldn't have happened I'd be out there. But we had a good road trip and now we just kind of move on."