Garza, who made just 18 starts last season because of an elbow injury, felt a twinge in his side while throwing on Sunday. The Cubs called it a "mild strain" but general manager Jed Hoyer said Monday that the right-hander will undergo an MRI so team doctors will have a better sense of how long Garza will be sidelined. Hoyer said Garza will need a "rest period" and the tests should reveal "how long that is."

 

Garza went 5-7 with a 3.91 ERA last year. He made his final start on July 21, when he left a game in St. Louis because of a "stress reaction" in his elbow.