McKenna believes other Australian centres would be more likely to gain inclusion in the BBL before a New Zealand team is considered.
"When we do [look at expansion], we've got at least three big population centres in Australia - Gold Coast, Canberra and Geelong - with great cricket venues and a cricket culture and a very big population and believe they should be the first cab off the rank. That's where it makes it hard for us at this current time to contemplate a New Zealand team being amongst that."
Despite that, the Big Bash continues to create ties with New Zealand sides, with the Sydney Thunder becoming the first BBL team to play a match in New Zealand when they faced Canterbury in an exhibition match late last year.
Partially as a result of that relationship, Canterbury batsman Henry Nicholls joined the Thunder as an injury replacement for Jacques Kallis for last night's must-win game against the Sydney Sixerts.
As those relationships continue to evolve, McKenna won't rule out a Kiwi side joining the league further down the track.
"The concept of New Zealand teams will certainly be discussed again before we make any final decisions on where's the best place to put expansion teams when that time comes."