The rotation was set until injuries put Yu Darvish, Derek Holland and Colby Lewis on the disabled list. Darvish, who threw a 46-pitch simulated game on Wednesday, is close to returning, but the Rangers haven't decided what his next step will be.
Lewis is out for two months because of the strained muscle in the back of his right shoulder. Holland is sidelined with shoulder inflammation, and the Rangers don't have a good idea of when he will be ready.
"We have to get him healthy and see where he is at," Daniels said.