The race to supply the fifth and final motorsport event at Mount Panorama is now down to Supercars and Australian Racing Group.

Bathurst Regional Council says it has invited the two organisations to take part in a selective tender process for the potential fifth event, which will join the Bathurst 12 Hour, Bathurst 6 Hour, Bathurst 1000 and Challenge Bathurst.

"Council is currently finalising the tender specification and we expect the two companies invited to take part in that process will receive those documents before the end of the month," mayor Graeme Hanger said.

"We anticipate council will consider these tenders in September."

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Council receives six EOIs for fifth event at Mount Panorama

Council called for expressions of interest (EOI) for a potential fifth event in March this year and received six EOIs - described as a strong response.

Three - Australian Racing Group/CAMS, Mountain Motorsports and Supercars - were shortlisted and representatives from each then met with council to provide more detail.