The Maori Council says it has little time to prepare its appeal over the Government's asset sales programme.
The council and the Waikato River and Dams Claims Trust have appealed against a High Court decision, that a partial sale of shares in Mighty River Power is not subject to judicial review.
Maori Council solicitor Donna Hall said the council would prefer the case went to the appeal court.
She said the Crown wants to leapfrog it to the Supreme Court to avoid disrupting the schedule for the partial asset float.
If the Supreme Court declines the case, it will go to the Court of Appeal at the end of January.
Ms Hall said neither side has much time to prepare their case and they will have to work through Christmas to be ready.