Cardoso has cautioned his players against underestimating their opponents because Sundowns reached the Champions League final last season.
“If we want to win this game against Remo Stars, we need to be strong," he said.
"If we think we are favourites because we were finalists last year, we will be making a big mistake. I don’t go along with this kind of attitude, we have two matches and they are going to be difficult on different conditions.
"We know what this team is capable of and we need to be loyal to ourselves by giving the best," added the former Esperance coach.
“We need to be focused on what we are going to do, otherwise, the story of the underdog can happen. We have to take this match seriously.”