The Greek government on Wednesday will table draft legislation to ratify a contract awarding a majority stake in the Piraeus Port Authority (OLP), and its management, to Cosco via a fast-track procedure.
The draft bill was given an "emergency" status by the government, with a vote by the plenum expected on Thursday.
The rush to ratify the contract apparently comes ahead of Greek Prime Minister Alexis Tsipras visit in a few days to Beijing.
Chinese shipping giant Cosco was the winner in a recent international tender to assume the port of Piraeus, the biggest and busiest in Greece.
