GCC states are scheduled to meet in Riyadh for the annual summit on Tuesday, where a much-anticipated resolve to the crisis is expected.
Lebanon, Syria and Iraq are among the countries chosen to represent Iran through international legal channels.
The United Nations has called on regional 'monitors' to observe the fragile ceasefire between the GNA and Khalifa Haftar's forces.
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Iran is marking the first anniversary of the assassination of its top military commander, General Qasem Soleimani.
The GCC has invited Qatar's emir in an effort to smooth relations between Saudi Arabia and the Gulf Kingdom.
The visit by the high-level Egyptian delegation was the first of its kind since 2014.
Saudi King Salman invited Egypt's President Abdel Fattah Al-Sisi to a much-anticipated GCC summit in Riyadh, according to reports.
Foreign ministers of Saudi Arabia, UAE, Bahrain, Oman and Kuwait took part in the meeting hosted by Manama, while Qatar was represented by its minister of state for foreign affairs.
New peace talks between the Taliban and the Afghan government is scheduled to take plate in Doha next month, an official said on Sunday.