"It's probably difficult for the doctors and trainers to get a sense of the degree just by feeling it," general manager Jed Hoyer said Monday. "There's really no accurate news today, we have to wait and see. The good news is his arm feels good."
Garza hurt himself Sunday in his first throwing session against hitters. He threw 20 pitches before feeling "something" in his left side that he initially thought was a cramp. He threw one more pitch before exiting practice.
"He was throwing well. It was unfortunate, for sure, it's going to set him back a little bit," Hoyer said.
Garza went 5-7 with a 3.91 ERA last season but missed the second half of the season with an elbow injury. Sunday was the first time he had thrown to hitters since July 21 in what ended up being his final start last season.
"I want to know why these injuries crop up," Hoyer said of the lat injury. "It seems to happen to a couple players on every team every year. Better in mid-February than mid-March."