Crain, who was sidelined a week in spring training with a right side oblique strain, injured himself in a weight room conditioning session on Friday in Seattle.
“I was doing some body cool down stuff and on a twist I felt something,” Crain said before the White Sox took on the Boston Red Sox on Thursday. “It’s definitely frustrating, but it is better to take care of something early in the season than let it go on a long time.”
Crain is not sure when he will pitch in a game next but hopes to avoid the disabled list.
“It was frustrating to get the first one (right side) and getting through that,” he said. “(Now ) to have this happen without even throwing is pretty frustrating .”
Crain, who made 67 appearances and had a 2.62 ERA last season, has two holds in seven innings over six appearances this season, striking out 10 against one walk.
“My target date would be (Saturday),” Crain said, “but I hope to get some more treatment (Thursday night) and (Friday) and throw another side (session ) on Saturday as it keeps (getting better ).”
Crain threw on the side to loosen up prior to the game on Thursday.