"We want as wide and as inclusive representation in all the various talks that are being held," Haq stated. "It is possible that if there are parties that are not in Astana, they can be included in the Geneva talks."
Haq also confirmed that the United Nations will be represented at Astana talks.
On Tuesday, the United Nations received an official invitation to the Astana talks.
Special envoy for Syria Staffan de Mistura designated his deputy, Ramzy Ezzeldin Ramzy, to represent United Nations at the talks.
The Syrian government and opposition factions are supposed to meet in Astana on Monday for talks brokered by Russia, Turkey and Iran. They will be followed by UN-mediated meeting in Geneva on February 8.
On Tuesday, Russian Foreign Minister Sergey Lavrov said Moscow considered it appropriate to invite representatives of the new US administration to Syria talks.