The International Monetary Fund (IMF) mission chief for Greece Delia Velculescu arrived in Athens on Thursday to join the negotiations between Greece and the institutions representing its creditors on a third financial assistance package.

Greece's air traffic controllers' union on Thursday announced a four-hour warning strike to be held next Wednesday from 14:00 until 18:00.

"Potami party will ally with the devil at this time to save the country, but this does not mean that in the elections it will align with the old political system," its leader Stavros Theodorakis on Friday said in statements to Focus fm radio station.

A draft bill envisaging a new concession contract between the Greek state and Piraeus Port Organization -still pending- will pave the way for the submission of binding offers in a tender to buy 51 pct in Piraeus port by the three candidate investors participating in the second phase of the tender (COSCO, AMP Terminals Maersk, ICTSI).