"Things change," Roenicke said. "Because things can happen those last couple days, we don't want to say who's coming and who's not and then something happens and then you're changing."
While Roenicke wouldn't say who would be joining the team, he did mention two players who aren't viable options as September callups: Double-A first-base prospect Hunter Morris and Triple-A outfielder Caleb Gindl.
Morris was named the MVP of the Southern League on Monday after hitting .303 with 28 homers and 113 RBIs for Huntsville this season.
"That's a heck of a year," Roenicke said.
Morris, MLB.com's No. 11 prospect in the Brewers system, is the first Stars player to earn the award since outfielder Corey Hart did so in 2003. Interestingly enough, Hart's current play is part of the reason Roenicke said Morris won't get a callup this month.
"I think what's hard is if you bring him up you want to give him an opportunity to play some, and with Corey the way it's been going, [Morris] isn't going to get much playing time," said Roenicke, who added that the Brewers didn't want to start Morris' Major League clock too soon.
As for Gindl, who was hitting .317 with a .423 on-base percentage for Triple-A Nashville, he won't get the nod due to back spasms that forced him off the field Saturday. Roenicke said the spasms were pretty severe and that Gindl is expected to miss at least a couple of weeks.