Rookie reliever Rafael Dolis had some minor back problems on Friday, but was able to pitch through it. He was available Sunday, Cubs manager Dale Sveum said.
Dolis, who has taken over the closer's duties, had some difficulty bending down, Sveum said.
The Cubs head to St. Louis for a quick two-game series on Monday and Tuesday against the first-place Cardinals.
"Obviously, they're the best team in the league, so we're going to have to shut them down," Sveum said. "They've got an American League offense right now. [Carlos] Beltran is on fire. They've penciled [Allen] Craig in from the [disabled list] and he's hit four, five home runs. You really have to keep those guys in the ballpark, and it's tough to keep them down."
The Cardinals lead the National League with 44 home runs; the Cubs have 19.
Adrian Cardenas collected his first big league hit with a double on Saturday. He got the ball authenticated, as well as the lineup card from the game.
"I feel like I play for the Cubs now," Cardenas said.