Lohse, who suffered a left groin strain while running the bases on Aug. 21, felt better a few days later and was disappointed that he was placed on the disabled list.
"Based on the way it felt the day after, I think everybody thought it would be best to not chance it," Lohse said. "It was probably the smart thing to do -- just to be careful with it -- but the way I felt today, I could go out there and pitch."
The righty is 5-8 with a 4.67 ERA in 18 starts this season. He said the club has not yet told him where he will be slotted into the rotation once he returns but that he will likely go on a rehab assignment five days before then.
Rookie Mitchell Boggs will take Lohse's place in the rotation on Saturday against the Nationals.
B.J. Rains is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.