"Why build new infrastructure when there is the under-utilised deep water port at Northport?"
He said Northport has already been mooted as an alternative to Auckland for vehicle imports while other options simply don't stack up.
"There is little doubt as a deep-water port Northport has both potential and capability to handle a lot of the Auckland's freight and presents the best and most viable option to the Port Future Study group," Mr Wilson said.
Study Group chairman Rick Boven said the study's consultants have projected Auckland's long-term future freight and cruise needs and assessed what could be required in 50 years to accommodate it.
"Auckland is on a steep growth trajectory. With an expected population of at least 2.6 million and potentially quadrupling of freight trade in the next 50 years. Auckland will need a strategy to ensure freight can flow for continued trade and prosperity", Dr Boven said.
He said once further analysis had been done there will be a clearer picture of how each option stacks up on costs and wider economic effects.
"Some options are likely to be cost prohibitive", Dr Boven said.
NZ First leader and Northland MP Winston Peters, who is campaigning for Northport to take over much of Northland's freight, said the shortlist options defies logic.
"The logical, and one would have thought, most obvious answer is Northport, the closest port to most of the country's international markets," Mr Peters said.
"But the Consensus Working Group making recommendations to the Auckland Council has turned a blind eye to even suggesting it might be a contender."
New Zealand First's member's bill, the Waitemata Harbour Protection Bill, is awaiting introduction to Parliament. It would stop expansion of the Ports of Auckland at its existing site.