Oman's health minister became the first to receive the Pfizer vaccine.
The official gave no specific date or details of what information the investigators would seek from Ghosn.
Tunisia's foreign ministry said it refuses to normalise relations with Israel.
Qatar sent a letter to the UN Security Council saying Bahrain violated its airspace with military jets four times.
Kuwait's prime minister was the first person in the small Gulf nation to receive the Covid-19 vaccine.
The softened rhetoric surrounding the three-year dispute comes amid Riyadh-led efforts to resolve the crisis.
President Donald Trump's special advisor and son-in-law has spearheaded normalisation agreements between Israel and Arab states this year.
Qatar is expected to recieve its first shipment of the shot on Monday, eligible to those aged 16 and above in the oil-rich gulf country.
The GCC will meet at the beginning of January in Saudi Arabia, Kuwait has announced.
Bhutan became the latest country to establish diplomatic ties with Israel, according to the Jewish state's foreign minister.