Baker gave his All-Star third baseman a break Monday, inserting Miguel Cairo in the lineup against the Pirates.
"We've got to space him," Baker said. "It's up to me to notice changes and various things, and I almost have to mandate that it happens. He's not that kind of guy [that would ask for a break]. But I can sort of tell."
Rolen did not get a break in the days after the All-Star break when the Reds played St. Louis, and he should be back in the lineup Tuesday.
"He really didn't get much rest over the All-Star break," Baker said. "We'd hoped that he would, had he not made the All-Star Game. ... They don't have those three days off."
Though Rolen has had trouble with his shoulder throughout his career -- he went on the disabled list for a short time earlier in the season -- Baker said the soreness was nothing to worry about.
"It's going to bother him," he said. "If you have three operations on it, it's going to bother you from time to time."