Those timelines could be altered by the team's medical staff. Garza has been on the disabled list all season with a right "lat" strain, and Knebel with a left oblique strain.
Both pitched two simulated innings early Saturday afternoon against teammates Martin Maldonado, Domingo Santana and Colin Walsh.
"I was anxious to go back up there again and face hitters," Garza said. "The second inning, everything came back to normal. I was back to trusting myself and pitching with no pain. I was pumped to be back out there again. I'm looking forward to the next step."
If Garza follows the path he said he is "pushing for," he would make only three Minor League starts before rejoining the big league club.
Knebel, meanwhile, will follow a plan similar to fellow reliever Will Smith, who is halfway through his own rehab assignment. Knebel is likely to pitch twice for Brevard County, with a day off between outings, before a promotion to a higher level for back-to-back games on June 4-5. Knebel expects that higher level to be Triple-A Colorado Springs, which plays at New Orleans on those dates.
"We were talking about it [before Saturday's sim game] and I told them, 'Hey, I'm going to be in there throwing as hard as I can. I want to give you all I've got and I want to see you swing,'" Knebel said. "They did. It was good to have some challenges in there.
"Everything feels good. I was 100 percent out there."
Smith remains scheduled for back-to-back mound sessions on Sunday and Monday with Double-A Biloxi. Since the Shuckers are off Monday, Smith will pitch a simulated game.
"We're within two weeks of having three guys back, so obviously that presents some decisions," manager Craig Counsell said. "But those are competitive decisions that you want to make, when you're choosing between good players."
• Santana, on the DL with a strained right shoulder, has made progress over the past week and should be back in right field for the Brewers on or soon after June 3, the first day he's eligible for reinstatement. Santana will depart for a brief rehab assignment before rejoining the Brewers' lineup, Counsell said.
• No. 2 prospect Brett Phillips was reinstated from the Double-A DL on Saturday. He'd been sidelined since May 18 by a strained left hamstring.