Danks felt an abnormal soreness in his shoulder on Sunday. The decision to place him on the disabled list was made after he had an MRI on Thursday. He has a 3-4 record with a 5.70 ERA this season.
"I think probably a little fatigue, just drained," White Sox manager Robin Ventura said. "He's going to end up missing (Friday's start). It looks like he'll probably end up missing (two starts). Nothing serious, just kind of getting out in front of it and make sure to take care of it."
Danks is expected to be officially placed on the disabled list Friday, and pitcher Carlos Quintana will be recalled from Birmingham to replace him in the rotation. Quintana is 1-3 with a 2.77 ERA in the minor leagues this season.
Danks received a five-year, $65 million contract extension in the offseason. He'll make $8 million this season and jump to $14.25 million from 2013-2016.
"I went and had a MRI this morning," Danks said before Thursday's game with the Minnesota Twins. "It was feeling different than I normally would. I'm no doctor, but I told them I was prepared to pitch tomorrow. I still feel like I probably could. Talking to (general manager) Kenny (Williams), Robin and (head athletic trainer) Herm (Schneider), it's better to be safe than sorry. I'll try to get everything completely right and get back up."
Danks said he felt something different in the back of his shoulder Sunday after pitching against the Chicago Cubs on Saturday. It was one of the best starts of his season, allowing three hits and no runs in 6 1/3 innings against the Cubs.
Danks was disappointed with Thursday's news because he was hoping to build off the Cubs' outing and turn his season around. Danks has allowed four or more runs in five of his nine starts this season.
"I've said it since my last start I was hoping it would be the start to jumpstart my season," Danks said. "Now here we are. It seems like if it's not one thing, it's something else at this point. Just trying to stay positive, get my work in and get healthy."
Danks said he hasn't felt any other out-of-the-ordinary soreness in shoulder before Sunday.
"It isn't the reason I've stunk to this point," Danks said.
Danks said he hopes to return to the rotation June 4.