Argentina's confidence would be high: they beat the All Blacks in New Zealand for the first time last year, beat England at Twickenham, and put 50 points on Australia in one of their Tests.
He said they were worthy rivals and definite contenders both for the Lipovitan-D Rugby Championship and the Rugby World Cup.
"Playing Argentina in Argentina, and in Mendoza, could be considered in the same light as playing South Africa at Ellis Park. This is a rugby city, the Argentinians are pumped to be playing here and they deserve all the respect they get."
Mo'unga said the atmosphere in Argentina was akin to that for football with plenty of passion, and that was more the case in Mendoza, a rugby city where the crowd at games could be hostile in their support of their side.
"You can get caught out if you haven't played here before or understand what it means to them to play in a city like Mendoza against the All Blacks."
While they loved their rugby, they also loved the All Blacks, and they received a warm welcome upon their arrival.
Argentine first five-eighths Nicolas Sanchez was rated highly by Mo'unga. He was a fine goal-kicker but underrated by many. But with improving stocks in the position, he was sure whoever was selected would thrive because of the speed and physicality in their forwards and the flair of the backs, which was always dangerous.
While Argentina had lost contact with New Zealand sides with the changes to Super Rugby and the loss of the Jaguares, Mo'unga said they were still playing top rugby in sides in Europe and were bringing that back to their Test preparations, which would help them.
"Whenever you play the Argentinians you expect the best Argentinian side and that's what you should do. You give them more respect. And they'll be fizzed for it because they will be playing in Argentina against the All Blacks.
While the All Blacks could see how players performed individually through video analysis, they could also reflect on how they did things in the past, which was relevant because the same coaching personnel were still involved.
"You assume things, but it doesn't mean you're going to get, it so you have a plan. But sometimes you've got to play heads up footy too, and I'm sure we'll get both cases this week - getting what we assume but them showing some things that are a little different, and we've got to be prepared for that as well."
MATCH DETAILS: All Blacks v Argentina, Sunday July 9, 7.10am NZT, Estadio Malvinas, Mendoza, Argentina. Live on Sky Sport NZ.