"Last night, it was swollen, and I woke up this morning, and it wasn't," Olt said. "That's a big step in the right direction."
He received plenty of treatment from the "big-word machines" that the Cubs athletic trainers have. Olt joked that he was ready for anything.
"I could probably steal a bag, whatever they need," he said.
Instead, he pinch-hit in the ninth and struck out, then stayed in the game at third base. The Cubs were short-handed because La Stella has been sidelined all weekend with the sore side, which he felt prior to Friday's game.
"I'm feeling better every day," said La Stella, who has not swung a bat for three days. "It's one of those things where you don't feel the need to rush it."
La Stella will be reevaluated on Monday.
"Like I was telling him, you have to have abdominal muscles in order to pull it," manager Joe Maddon said. "Fortunately, he doesn't have any abdominal muscles that get in the way of that."
Pitcher Travis Wood was listed on the Cubs lineup sheet as a right-handed hitter off the bench, and he did get an at-bat on Sunday. Catcher Welington Castillo has been working out at third base in case the Cubs need a backup.
When Olt had to leave Saturday's game, there was social media buzz that the Cubs would promote top prospect Kris Bryant.
"Not today," Maddon said.
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.