A significant number of players signed with NZ Rugby – including many who have represented the All Blacks – have Pacific Island heritage.
Kefu said he hopes the initiative can draw a passionate Tongan crowd as seen when the Tongan rugby league team visited New Zealand in recent years.
"I think it's more good than bad, our guys play on emotion, and they get a lot of that emotion from family, from supporters," he told 1News.
"It could be a distraction, sure, but it's more of a plus for us.
"And if we can feed off that and use that, it's going to put us in good stead."
The Eden Park double-header is billed as the 'Pasifika Challenge II – Road to Japan'.
Tonga will face the All Blacks in Hamilton a week later as a warm-up match for the 2019 Rugby World Cup.