Yankees setup man Rafael Soriano did not pitch in his regular spot in the eighth inning on Sunday because of a strained lower back. He believes he may be able to return as early on Monday night against the White Sox. "I don't think it will be serious," Soriano said. "We'll see what happens on [Monday.] I'm going to play catch and see what happens. I'll do my regular routines." Soriano said he first felt the back hurting on Saturday. New York went to Dave Robertson in the eighth on Sunday.