After throwing for six minutes on flat ground, Sheets tossed eight warmup pitches off the mound before beginning the bullpen session. He pitched 25 two-seam fastballs, then six curveballs and finished with 33 more fastballs.
"He looked pretty good today," Brewers manager Ned Yost said. "He's getting stronger and feeling better. He's getting closer to going out."
But the Brewers, who are also without starter Tomo Ohka, don't want to rush Sheets through his rehabilitation and risk his future.
"You just want to make sure that when you get him back that it's right," Yost said. "You want him for the long haul and that's really, really important.
"You don't want to push him and you don't want to have him go through all this and then have a setback. We think that's the most important thing to do when you start getting excited and you start accelerating the process a little bit."
Waiting on All-Star announcement:
Yost, who helped Atlanta manager Bobby Cox put together the National League All-Star team a handful of times, said he can't wait for the team to be announced on Sunday. Milwaukee's Carlos Lee, Chris Capuano and Derrick Turnbow are all candidates.
"I'm really anxious," Yost said. "I know it's a tough job because I've helped Bobby do it five times, but I'm really interested to see what happens.
"It's tough to try and pick an All-Star team. It's not as easy as you think it is."
Friday night's 8-2 loss against the Twins was the Brewers' 81st game of the season. They posted a 40-41 mark for the third time since joining the National League in 1998, which is the second-best record in the time period. The Brewers went 43-38 in 2004 and 1998.
Brewers bits: Left-hander Doug Davis threw a bullpen session Saturday and said his back feels fine. He's slated to start Tuesday against Cincinnati, but may pitch Monday if Dave Bush is used in the bullpen. ... Both teams will wear special caps Saturday and Sunday to honor the Army, Navy, Air Force, Marines and Coast Guard. ... The Brewers and Twins rank second and first in their respective leagues for the best home record. But they are two of seven teams in the Major Leagues with 15 or fewer road wins.
On the farm:
Catcher Mark Johnson went 3-for-3 with a two-run homer Friday night, but Triple-A Nashville lost to Round Rock, 8-2. The Sounds' bullpen combined for three innings, allowing six hits and six earned runs. ... First baseman Jeffrey Eure hit 4-for-4 with a home run as Double-A Huntsville lost to West Tennessee, 5-4. ... Class A Brevard County tallied 10 hits but didn't score in a 1-0 loss to Palm Beach, leaving nine runners on base.
The Brewers finish Interleague Play and their three-game set at Minnesota on Sunday at 1:10 p.m. CT. Zach Jackson squares off against Twins left-hander Francisco Liriano.