Former Prime Minister George Papandreou angered PASOK colleagues on Friday by agreeing to sit on the same panel at a book launch as Democratic Left leader (DIMAR) Fotis Kouvelis a month before European Parliament elections.

Papandreou is to appear on Monday at the launch of a book written by Marilena Koppa, an MEP who recently quit PASOK to run with DIMAR in next month’s ballot. DIMAR refused an invitation to join the Olive Tree alliance that PASOK will run with for the May 25 vote.

“Mr Papandreou is doing PASOK a lot of harm,” Socialist MP Michalis Kassis told Mega TV on Friday. There were also reports that the ex-premier’s decision angered PASOK’s leadership.