"We'll continue to try to match him up and give him some of the best possible situations he can have and gain some confidence and move forward," Renteria said.
Olt batted .276 in Spring Training, and has been used in a platoon at third with left-handed-hitting Luis Valbuena.
"He was outstanding in Spring Training," Cubs general manager Jed Hoyer said. "I think if you asked him, he's had some good at-bats and some bad at-bats over the last few weeks. I think he's come along pretty well defensively. His throwing has gotten better as his shoulder has gotten stronger.
"Now, hopefully, it's a matter of stringing some hits together and getting on track offensively," Hoyer said. "I like what we see from him. Right now, he's playing through a slump."
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.