New York Yankees reliever Scott Effross will be sidelined for an extended period with a Grade 2 left hamstring strain, manager Aaron Boone said Thursday.The right-hander’s latest injury is “going to take some time” to heal before he can return to the mound, Boone told reporters in Tampa, Fla.Effross, 31, was pulled from Tuesday’s spring training game against the Minnesota Twins after throwing one pitch in the eighth inning. He received a platelet-rich plasma (PRP) injection on Thursday.