Extra bases

• Cubs pitcher Matt Garza threw a bullpen session Sunday at Miller Park, and the next step will be a Minor League rehab start for Double-A Tennessee.

Garza, coming back from a strained left lat sustained in mid-February, threw two innings on Friday, the first time he was in a game situation since the injury.

• Ian Stewart, who missed all of Spring Training with a strained left quad, played nine innings for Triple-A Iowa on Saturday and now is 1-for-13 with eight strikeouts and three walks in four Minor League games.

"We're not in a big hurry," Cubs manager Dale Sveum said of Stewart's return. "[Luis] Valbuena has been one of our most consistent players defensively and offensively and he's getting his walks. He's doing a great job. There's no real urgency. [Stewart] has got to go down there and get hot swinging the bat."

The Cubs are a little short in backup infielders with only Cody Ransom available. If necessary, Sveum said catcher Welington Castillo could sub in the infield.

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.