"It's kind of day by day," Lohse said. "[Returning Thursday] is what we're hoping for, that's what we're shooting for. It's hard to tell you right now."
The next step for Lohse is to throw a bullpen session on Monday, but Lohse said, "Don't hold me to that."
Lohse said he is trying to be smart about the injury by resting it now in the early part of the season.
"The worst thing to do is to keep irritating it when it doesn't feel right," he said. "To keep pushing is asking for a year-long thing."
Adam McCalvy is a reporter for MLB.com. Read his blog, Brew Beat, and follow him on Twitter at @AdamMcCalvy. Kevin Massoth is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.