A visit to Athens by EU and IMF inspectors adds to pressure on not just the government, but the Greek opposition to support planned austerity measures to win new loans and avoid bankruptcy.
A parliamentary confidence vote is due this Tuesday night on the prime minister’s new cabinet.
Protesters also plan a big rally on Tuesday ahead of the confidence motion.
Greek state utility workers launched a 48-hour strike at midnight on Sunday.
Athens aims to cut the country’s public work force by a fifth over the next five years.
The government spokesman, meanwhile, said: “We will continue to listen to the messages of Greek society. We will seek systematic results by meeting economic targets… [and] we want to give hope to the average Greek family.”