"Didn't have any setbacks," Cubs manager Rick Renteria said. "So we'll see how he feels [Sunday], how he reacts. He looked good."
Renteria added that if Rondon does feel better on Sunday, he could be available to pitch.
The right-hander hasn't pitched in a game since June 6.
"We weren't concerned about it. I think we're just more airing on the side of caution. I think that's the prudent thing to do."
Erik Bacharach is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.