Athletics activated RHP Michael Wuertz from the 15-day disabled list.

Wuertz gave up seven runs on eight hits over four rehab appearances between High-A Stockton and Triple-A Sacramento. He was placed on the disabled list with a hamstring injury after making a scoreless appearance on Opening Day.

A's manager Bob Geren wants Michael Wuertz (hamstring) to look sharper in his rehab outings before calling him back up.

Wuertz, who will pitch for Triple-A Sacramento on Saturday, got tagged for three runs in just one inning on Wednesday. That prompted Geren to say "hopefully he'll be more efficient (on Saturday), get sharp. He hasn't been sharp yet." If Wuertz looks good on Saturday, it's possible he could rejoin Oakland by as early as Monday.

Michael Wuertz (hamstring) will make at least one more rehab appearance at Triple-A Sacramento.

Wuertz was lit up for three runs in one inning Wednesday. The A's want to see him handle lesser competition before they throw him back into the big league fire.

Michael Wuertz (hamstring) will make another rehab appearance with Triple-A Sacramento Wednesday.

It will be an "extended" outing where he'll be stretched out a bit. Wuertz was originally supposed to be activated from the DL Tuesday, but the A's want him to get a bit more work in so that he comes back sharper. The right-hander said he feels "incredible" and that "If it was up to me, I'd like to be activated today."

Michael Wuertz (hamstring) is expected to rejoin the A's bullpen on Tuesday.

Wuertz has been on the disabled list since the first week of the regular season due to a left hamstring strain. He made a rehab appearance Saturday evening at Single-A Stockton and will make another on Monday.

Michael Wuertz (hamstring) surrendered three runs on four hits -- including a home run -- over one inning in his first rehab appearance for Single-A Stockton Saturday.

Ouch. Clearly Wuertz has a ways to go if he's struggling this badly to retire A-ball hitters. He should be back before the end of the month, though.

Michael Wuertz (hamstring) will throw an inning for Single-A Stockton Saturday in his first rehab assignment.

Wuertz appears to be over his hamstring injury and probably won't need much rehab time before being ready. He'll be back in the A's bullpen before Andrew Bailey.

Michael Wuertz (hamstring) threw a successful simulated game on Thursday afternoon.

"It went good," Wuertz said after the workout. "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." He's expected to begin a minor league rehab assignment at some point this weekend.

Michael Wuertz (hamstring) is expected to pitch in a simulated game Thursday and then start a rehab assignment likely on Saturday.

Wuertz missed a good chunk of spring training with a shoulder issue and then hurt his hamstring early on in the season. He shouldn't need much time on a rehab assignment, though, so if all goes well, a return next week seems likely.

Athletics placed RHP Michael Wuertz on the 15-day disabled list with a strained left hamstring.

Wuertz hadn't pitched since Friday and the A's obviously deemed that he would not be available this week. Tyson Ross has been recalled to take his bullpen spot.

Michael Wuertz pitched a scoreless inning Tuesday in his Cactus League debut, giving up a hit and a walk while striking out one Cubs batter.

Though it looks like Andrew Bailey could be OK, Wuertz will become an even bigger part of the A's bullpen should the closer suffer a setback. He's dealt with shoulder issues this spring but should be fine to start the year as long as he doesn't hit a bump in the road.

Michael Wuertz (shoulder) will make his Cactus League debut Tuesday.

Wuertz has thrown enough successful bullpen sessions and batting practices to live game that the club feels comfortable throwing him out there. The 32-year-old right-hander posted a 4.31 ERA and 1.41 WHIP across 39-plus innings of relief last year. He will operate in middle relief this season.

Michael Wuertz (shoulder) will throw one more bullpen session before appearing in a game.

Wuertz threw 20 pitches in live batting practice on Wednesday, so it sounds like he's awful close to making his spring debut. It's possible that could happen as soon as this weekend.

Michael Wuertz (shoulder) is scheduled to throw 20 pitches in live batting practice Wednesday morning.

Athletics manager Bob Geren calls it a "best-case scenario," but assuming all goes well, he could make his Cactus League debut by as early as Saturday. Wuertz was shut down early in camp due to inflammation in his throwing shoulder.

Michael Wuertz (shoulder) threw a successful bullpen session Friday in A's camp.

Wuertz tossed 30 pitches and reported no abnormal pain or discomfort in his throwing shoulder, which was revealed to have a mild amount of inflammation last week. The right-handed setup man should begin making Cactus League appearances shortly.

Michael Wuertz (shoulder) has resumed throwing.

Wuertz was shut down last Monday due to inflammation in his throwing shoulder, but the A's feel confident enough to ramp up his workload. He could appear in his first exhibition game by the end of the week.

Athletics manager Bob Geren said Wednesday that Michael Wuertz (shoulder) could resume throwing this weekend.

Wuertz was shut down earlier this week after feeling a twinge in his shoulder. The 32-year-old right-hander tried to pitch through a similar issue last spring and ended up beginning the season on the disabled list. The A's don't want a repeat this year, so they are taking a conservative approach.

Michael Wuertz doesn't anticipate that his recent minor shoulder injury will be a problem.

The A's decided to shut Wuertz down from throwing for the next couple of days, but he should be up and running by the weekend. The right-handed reliever told Susan Slusser of the San Francisco Chronicle on Tuesday morning that he gets routine soreness in his throwing shoulder every spring around this time.

Michael Wuertz will be shut down for the next few days with a shoulder injury.

The A's are calling it a minor issue and expect Wuertz to be back to his normal spring throwing routine by the end of this week. The 32-year-old right-hander posted a 4.31 ERA and 1.41 WHIP across 39-plus innings of relief last year. He will operate in middle relief this season.

Michael Wuertz does not anticipate needing surgery on his right thumb.

Wuertz missed the final nine games of the 2010 season because of tendinitis in his right thumb. He's hoping rest and rehab will do the trick and allow him to open spring training next season at full health. The 31-year-old righty posted a 4.31 ERA and 1.41 WHIP in 39 2/3 innings this year.