Januzaj was close with an instinctive effort after a Larnell Cole shot rebounded back to him.
Although City substitute Jordan Richardson hammered a drive wide, United continued to press but the classy Powell could not divert his header on goal after rising well to meet a Januzaj corner. The closing stages were rather scrappy and there could be few complaints about the stalemate.
United: Johnstone; Vermijl, Wootton, Fornasier, McGinty; Cole, Thorpe, Tunnicliffe, Powell, Januzaj; Macheda. Subs not used: Veseli, Sutherland, Lawrence, James, Ekangamene.