"It will be more difficult this time,'' Tribulietx said. "It's the Japanese champions on their own ground. But we're leaving nothing to chance and we'll be prepared for the game. We're ambitious and believe we're a good team. We're going to give it our best effort.
Auckland City has overcome similar odds before.
Two years ago, a 3-0 defeat to Mexico's Atlante was bookended by a 2-0 win over Al Ahli and a 3-2 win over African champs TP Mazembe - a side who finished runners-up to Inter Milan last year - to achieve an astonishing fifth-placed finish. They also picked up US$1.5 million.
"What we achieved in Abu Dhabi in 2009 doesn't happen very often so we must be realistic about our chances,'' Tribulietx said. "Anytime an amateur team plays a professional side, you have a tough game.''
If Auckland City pull off an upset win, they must then back up for a quarter-final showdown with either Esperance, Al-Sadd or Monterrey just two days later.
"We have to concentrate on the first game and worry about the second one when and if it happens. I think everybody is aware the challenge is different this time playing the J-League winners first. There is no pressure to repeat what we did two years ago,'' Tribulietx said.
Auckland City plays two games before departing for Japan.
On Saturday, they host Hekari United of Papua New Guinea in the O-League before their final ASB Premiership game with YoungHeart Manawatu on Sunday week, also at home.