Ryan Zimmerman could be headed for the disabled list after an MRI on his shoulder didn't come back favorably. "At this point, as far as I know, it's not real favorable," manager Davey Johnson said. "It looks like he's going to need to some more rest. We'll just have to wait and see." Washington planned to wait at least until Wednesday to make any roster moves. If Zimmerman lands on the disabled list, Johnson said he would use Mark DeRosa, Chad Tracy and Steve Lombardozzi to replace Zimmerman at third base.