The Cubs will place Randy Wells and Andrew Cashner on the disabled list, leaving them without the back end of their starting rotation. Cashner has a mild strain in the back of his rotator cuff after leaving Tuesday's start against the Diamondbacks with stiffness in his right shoulder. Wells has a right forearm strain. Casey Coleman will be recalled from Triple-A Iowa and is expected to start Sunday against the Brewers. Chicago manager Mike Quade said left-handed reliever James Russell might be stretched out to take the fifth spot in the rotation and start on Tuesday in Houston. "The way I'm looking at it now is over the next three weeks we need a line of three Tuesdays, where we need pitching," Quade said. "Whether that's [Russell] coming out of the chute or whether someone takes the bull by the horn in the minor leagues and establishes themselves, we need somebody three times in three weeks."