The Hammers have paid perhaps bizarrely paid £600,000 for the left-back and also allowed Clive Clarke to head in the opposite direction, to the Stadium of Light.
McCartney is currently sidelined with a knee injury and is set to be out of action for another 10 weeks however he somehow completed an ‘initial medical' and ‘will be assessed again upon his return to full fitness'.
One can only guess as to the logic of giving away a defensive squad player and replacing him with another who won't even take the field until November.