FRANKFURT, Aug 23 (Reuters) - Volkswagen AG's management is eyeing the potential acquisition of the Alfa Romeo brand should Fiat SpA consider putting it up for sale, German auto industry newspaper Automobilwoche reported. "Alfa is a globally recognised brand with sporty genes and a great tradition," the paper quoted a "high ranking" VW manager as saying. "If such a treasure could be had, we must not hesitate ... too long."