Manager Alex Cora announced Friday that Perez will exit the starting rotation and move to the bullpen, Pete Abraham of The Boston Globe reports.
The left-hander has an 8.53 ERA across his past five starts (19 innings) and will depart the rotation in favor of Tanner Houck. Chris Sale is also nearing his return from the injured list, which should close the door on Perez rejoining the rotation down the stretch.