Matt Garza has mild lat strain

MESA, Ariz. -- Chicago Cubs pitcher Matt Garza left the practice field with a mild lat strain in his left side Sunday, but the injury isn't expected to be serious.

"It's not that bad," Garza said after getting checked out. "It's just kind of day to day."

Garza was 20 pitches into a 40-pitch batting practice session when he felt something he thought was a cramp. He was attended to on the field and walked back to the clubhouse with a trainer.

"I threw the first fastball from the stretch and thought water cramp," he said. "Then the next one, and figured I'm not going to push it."

Garza missed most of the second half of last season with a stress reaction in his right arm. He was expected to be dealt at the trade deadline until suffering the injury on July 21. His season ended with a 5-7 record and 3.91 ERA.

Garza said his arm felt fine during the session.

"It shouldn't be a big thing," Garza said. "We'll see tomorrow. I'm not going to push it if I don't have to."

Earlier in the week Garza said he got "every muscle" in his body ready for the upcoming season considering the doctors weren't exactly sure what caused his elbow issue last season.

"I've done everything you could ask," Garza said.

Garza signed a one-year, $10 million deal this past offseason. He's slated to become a free agent after 2013.