Greek authorities on Tuesday will open financial offers submitted in a tender to buy 67 pct of Piraeus Port Organization, a process characterized as the country's biggest challenge so far in its drive to put Greece again in the map of international investment funds.

A new contract between the Piraeus Port and the Greek state will include an increase in the annual cost of the lease, from 2 pct of total annual revenue at present to 3.5 pct of annual revenue, media sources said on Thursday.

The Regal Princess cruise ship, which is the globe's youngest and biggest, is set to sail into the Port of Piraeus today.