Saudi Arabia, Egypt, the United Arab Emirates (UAE) and Bahrain are expected to discuss imposing new economic sanctions on Qatar when they meet in the Bahraini capital Manama on Sunday, the pan-Arab al-Hayat newspaper reported.
The four Arab states cut ties with Qatar on Jun 5, accusing it of backing terrorist groups and cosying up to their arch-foe Iran, allegations Doha denies.
Foreign ministers of the four countries "are expected to impose sanctions that will gradually affect the Qatari economy", al-Hayat newspaper said, citing unidentified Gulf sources, without giving any further details.
Bahrain's state news agency BNA said on Saturday that King Hamad bin Isa al-Khalifa had hailed cooperation between the four countries in fighting terrorism.
Diplomatic efforts led by Kuwait and involving the United States and Turkey have failed to end the row, which has affected travel and communications between Qatar and the four countries and led to harsh verbal exchanges in the media.
Saudi Arabia has closed its land border with Qatar while all four countries have cut air and sea links with Doha, demanding the gas exporting country take several measures to show it was changing its policies.
Turkey and Iran have stepped in to provide fresh produce, poultry and dairy products to Qatar instead of Saudi Arabia and the UAE, with Oman providing alternative ports to those in the UAE.
The four Arab countries added 18 more groups and individuals they say are linked to Qatar to their terrorist lists last week.