The union representing Auckland's waterfront workers says a four day closure of the port next month will not stop container ships from unloading.
Ports of Auckland plans to lock workers out for four days from 1 December after the union called a strike for two days.
The standoff follows a breakdown in collective bargaining talks.
The port says the lockout will force some ships to divert to Tauranga and up to 7000 container movements could be affected.
However, the Maritime Union says ships will still be able to berth at Auckland.
It says there are three other stevedoring companies on the waterfront besides Ports of Auckland and the other companies will not be affected by the lockout and will be able to unload cargo.
The port says the four day closure could cost $1.6 million in lost revenue.
The union says it is keen to resume negotiations but has been rebuffed by the port.