The New Zealand side meet CONCACAF champions Atlante in Abu Dhabi tomorrow fresh from upsetting the odds by posting a 2-0 victory over United Arab Emirates outfit Al Ahli in the tournament curtain-raiser on Wednesday.

The Oceania champions, comprised of students and part-timers and accustomed to playing in front of crowds of just several hundred in their homeland, face a far sterner test against their Mexican opposition tomorrow, however.

Posa nevertheless believes his side can bridge the gulf in class, and has called for a professional approach from his players to get the job done.

"I'm confident the boys will put in a good performance and give their best," Posa said in quotes reported on www.stuff.co.nz.

"Outside Barcelona and Estudiantes, Atlante are the best and most classy team at this tournament.

"If we're organised, play well and work really hard again maybe we can upset their rhythm.

"A professional attitude costs nothing.

"We're not in a position in New Zealand to have a professional league but we have a professional attitude with this group of players because they have been determined to do well since day one."

A first-half strike by Adam Dickinson and a thunderous 30-yard drive by Chad Coombes secured victory over Al Ahli in midweek, and Auckland's hero from that match insists his side are in the mood to spring another surprise.

"We've been watching videos of Atlante and we know it will be very tough for us," Coombes told FIFA.com.

"They're a great side with some experienced and outstanding professionals.

"We know we'll be up against it but we'll do our best to cause an upset."

One of those seasoned Atlante campaigners is the vastly experienced former Real Madrid and Inter Milan winger Santiago Solari, who has warned against his side making any slips in their bid to face Barca in the last four.

"We've got to win one game to open the door to a semi-final against Barca," the 33-year-old Argentinean said.

"This is our key match, we really need to focus on this encounter."