Shortstop Jean Segura was out of the lineup Wednesday after hurting his left ankle or foot on a play at first base in Tuesday's victory. He stepped on Cubs reliever Carlos Marmol's foot as Marmol reached for the bag.
Roenicke hopes to have Segura back on Friday in Pittsburgh.
"He's limping, so today, he's going to see what he can do, whether I can use him out there or not," Roenicke said. "I don't expect it to be more than a couple of days to get him back in there starting. You never know how these guys heal. When you're 22, you seem to heal a lot faster."
Shaun Marcum will take recently released left-hander Randy Wolf's place in the Brewers' rotation, meaning Marcum will start Saturday in Pittsburgh. He has been on the disabled list since mid-June with a stiff right elbow.
The rest of the Brewers' starters will stay in line, so Mike Fiers will pitch Friday's series opener against the Pirates and Mark Rogers will work Sunday's finale.