Pandemic restrictions have forced the cancellation of the New Zealand and Perth races in the Supercars Championship, as organisers scramble to save the Bathurst 1000.

Bathurst, the most high-profile event in the calendar, was scheduled to run from October 7 to 10 but will now be held from November 4 to 7, due to COVID-19 restrictions currently in place in NSW.

"With the ever-changing COVID landscape, our teams and broadcast partners have agreed it is in all our stakeholders' best interests commercially and competitively to move our premier event to a later date," Supercars CEO Sean Seamer said in a statement.

With new travel restrictions imposed between NZ and Australia, teams will not be able to cross the ditch to compete. In addition, border closures in Western Australia placed the Perth race in jeopardy.

"Unfortunately, our event planned for Perth presents significant risk with the ongoing restrictions, so we've made the difficult decision to move it to the 2022 calendar," Seamer said.

"Similarly, our Kiwi fans across the ditch will be undoubtedly disappointed to see New Zealand does not feature on the revised calendar due to the trans-Tasman bubble being suspended.

"These are challenging times for all sporting codes, which is why we have had to remain flexible with our calendar arrangements and make significant changes where required."