i don`k know ur network topo.how many vSW and how the manager、vMo、prod use port
i assume that u have remore a host to new VC and did not add host to the new VC``s vDS.
though the vDS same info, but for the new VC, ur host not in it`s distributed switch.
maybe u can manage ur host virtual sw, remove one of ur port to free.
then add ur host to vDS and use the free port
if there is no prod VM on the host
u need test the vDS port, maybe u can deploy one or more VM to the host.
remove another vDS port, to check if the new one works.
Then Migration ur VM from old vc to new vc(if u use vc7, if not u need a tool)