Qatar's Emir Sheikh Tamim bin Hamad Al-Thani received a "formal invitation" from Saudi King Salman to the January 5 meeting of the six-nation PGCC in Saudi Arabia's northwest Al-Ula province, AFP reported.
But it is not yet clear if Sheikh Tamim -- who was invited to the last summit but declined, sending then-prime minister Abdullah bin Nasser bin Khalifa Al-Thani instead -- will attend.
As well as Saudi Arabia and Qatar, the PGCC includes Bahrain, Oman, Kuwait and the United Arab Emirates (UAE).
In June 2017, Saudi Arabia led its allies the UAE, Bahrain and Egypt to cut ties with Qatar, saying it was funding extremist movements -- which Doha staunchly denies.
After severing ties, the four countries issued a list of 13 demands for Qatar, including that it shut down its broadcaster Al Jazeera.
The Saudi-led quartet subsequently forced Qataris to leave, closed their airspace to Qatari aircraft and sealed their borders and ports, separating some mixed-nationality families.
Sheikh Tamim's participation would signal an easing of divisions.
On Wednesday, Saudi's cabinet said that it "wished for a successful summit to enhance joint action and enhanced cooperation between the country members," according to a statement on the official Saudi Press Agency.
It follows comments earlier this month by Saudi Foreign Minister Prince Faisal bin Farhan who said that a resolution was in sight.
Egypt and the UAE have since given their public support to the negotiations, although diplomatic sources say the UAE has been reluctant to compromise.
According to an official close to the negotiations, it is unlikely the summit will deliver a comprehensive agreement but rather result in trust-building measures, including the possibility of opening up the airspace.