"It was just an oversight," he told Radio New Zealand.
"I'd asked for it to be removed because it is something around which we still need as a council to discuss further, and we would consult with the public around that."
But a possible sale of the land had been discussed by council, he admitted, saying: "The discussion involves, ultimately, what is the final outcome of use for Lancaster Park and we haven't got to the end point of determining that yet.
"We want to have a public conversation about it and it shouldn't be in the draft report."
Any potential assets sales will be added in next year's annual plan, he said.
The future of the Lancaster Park site - most recently called AMI Stadium - remains uncertain, with the council still in discussion with its insurers, local government-owned Civic Assurance.