"I got my ground balls in," Clevenger said. "I feel very comfortable over there. I played infield when I was first drafted. It's nothing new to me, just getting the [repetition]."
He did play more infield this spring than in the past. Last year, Clevenger won a spot on the Cubs' Opening Day roster as a backup catcher.
"It's just a reaction position at third," he said. "It's basically catch it and throw it."
He's also prepared as far as equipment.
"I always keep my infielder's glove broken in," he said.
"If he's going to be here, he has to play," manager Dale Sveum said of Clevenger, who is the third catcher on the Cubs' roster. "It's time to get him in the lineup against Cain and see what happens."
Third baseman Ian Stewart, on the disabled list with a strained left quad, has been rehabbing at extended spring camp, and he played four innings on Thursday, hitting a couple of doubles. Sveum said he expects Stewart will begin a Minor League rehab assignment soon.
Carrie Muskat is a reporter for MLB.com. She writes a blog, Muskat Ramblings, and you can follow her on Twitter @CarrieMuskat. This story was not subject to the approval of Major League Baseball or its clubs.