Ireland travel to the Cardiff City Stadium looking to build confidence ahead of their crucial World Cup qualifiers with Sweden and Austria in September.
They will face a Wales side without star man Gareth Bale, but Trapattoni insists Wales are not a one-man-team, and he expects Craig Bellamy to pose a threat to his defence.
"This is no friendly," Trapattoni said. "I know this country. I was here many years ago with Italy, as was their scorer that night, Bellamy.
"We won in Italy but we lost over here and we know about this team, I have seen so many games and I know the Welsh players, they have a good mentality and they are international players.
"After this game we can reflect, and we will know from our attitude and personality whether we are ready to play against Sweden."