China's Cosco Group and five other investors have expressed interest in a majority stake in Piraeus port (OLP), the largest in the country, Greece's privatisation agency HRADF said on Monday. Cosco Group's initial interest for a 67 percent stake in OLP, is further highlighting Chinese investors' appetite for Greek assets as the state sells off parts of its businesses to go some way to balance the bailed out country's books. Greece last month picked a Chinese-backed bid to develop a prime seaside property at the former Athens airport Hellenikon.