Greek truck drivers are to decide whether to pursue a strike or return to work after thousands took action earlier this week, disrupting supplies across the country.
They are protesting at plans to increase competition by cutting the price of new licences.
The strike has caused petrol stations to run out of fuel, leading to long queues.
Food supplies to Greek islands and tourist areas have also been hit, prompting the government to requisition lorries.
“I think there’ll be new developments today,” said Dmitris Makrivelios of a union representing service station owners. “The information we have is that privately licensed trucks have been loaded in order to supply fuel to all the service stations that are unfortunately facing problems.”
The drivers took their protest to the Transport Ministry in Athens, leading to brief scuffles with police.
The market reforms they oppose are part of the terms of the international bailout plan.
But there are fears that more tourists may cancel their holidays as the season approaches its height.
Many visitors have stopped hiring cars because of the fuel shortage.