Lohse has experienced discomfort in his elbow over his past several starts, but the Brewers expect that the right-hander will return to the rotation after missing Saturday's game against the Pittsburgh Pirates.
"He didn't seem that concerned about it," Roenicke said, according to multiple media reports. "We're hoping that it's not that big of a deal."
Lohse, 34, joined the Brewers near the end of spring training, signing a three-year contract worth $33 million. The 13-year veteran is 1-5 with a 3.76 ERA in nine starts this season.
"He could go out and pitch," said Roenicke, who expects Lohse to miss just one start. "But because he didn't have a spring training, we would rather try to get rid of this, so we're going to bump him a start."
Roenicke said that right-hander Mike Fiers will replace Lohse on Saturday against Pittsburgh.
Fiers, who went 9-10 with a 3.74 ERA as a starter in 2012, has been used primarily out of the bullpen this season, posting a 5.93 ERA.
Information from The Associated Press was used in this report.