Chicago Cubs pitcher Matt Garza suffered a mild strain of a lat muscle that caused him to cut short a live batting practice session on Sunday in Mesa, Ariz., the Chicago Tribune reported.
Garza grabbed his left side during the session, and after Cubs trainer PJ Mainville went to the mound to check on Garza, he left the field after throwing 20 pitches in what was scheduled to be a 40-pitch session.
Cubs manager Dale Sveum said the injury a mild lat strain, and said it would be evaluated on Monday.
"It has subsided and he seems to be doing a lot better now," Sveum said, according to the Tribune.
Garza missed the final two months of 2012 with an elbow injury, but he said the problem on Sunday had nothing to do with his elbow.
"The elbow was fine," he said. "Everything on my right side was fine. So I was like 'What the hell?' The ball was coming out of my hand good, I had good control, downward movement. I was happy I threw the ball well. A little frustrated, but it's early."
Garza went 5-7 with a 3.91 for the Cubs last season.