Manager Ron Roenicke and pitching coach Rick Kranitz have a Plan A and Plan B, and will pick based on the results of Marcum's outing in Beloit, Wis., on Wednesday night. In one scenario, the Brewers would bump right-hander Mark Rogers' next start by a day to keep Marcum on his fifth day -- Monday against the Cubs at Miller Park -- and could at least temporarily employ a six-man rotation.
An off-day later that week would prompt some further shuffling, Roenicke said.
"I can't really say exactly what's going on," Roenicke said. "We have it planned out, but we're still going to wait and see what happens, for one, with Marcum today, to see if he's OK and if he needs another start in the Minor Leagues."
More changes could be ahead for the Brewers' rotation, with some young pitchers (Mike Fiers, Rogers) potentially reaching innings limits and others (Wily Peralta, Tyler Thornburg) in line for September call-ups. Roenicke said he expects left-hander Randy Wolf to remain in the rotation through the end of the season.