ATHENS - China’s Cosco is among investors expected to bid for the development and operation of a freight centre with access to the national railway network and Greece’s largest port in Piraeus, a government official told Reuters on Wednesday. Binding bids for the 250 million euro project are expected to be submitted by May 31. “One of them (investors) is Cosco, but we believe that there won’t be only one bid,” the official said on condition of anonymity. A Chinese investor is also interested to build and operate a 850 million euro airport on the island of Crete. Binding bids are due on Feb 23. “There are at least three interested parties,” the official said.