Ireland coach believes that there is no need to change his system if players adapt and show attitude against the world and European champions
However, the 73-year-old suggested that he would only make changes to counter the threat posed by Spain, not because of the team's last performance against Croatia, which has left the Boys in Green bottom of the standings.
“Jonathan has shown us that with his physical strength the way he can help both the strikers and the midfield,” Trapattoni told the Irish Times. “Spain are technically superior on the pitch and maybe I can change things to react to them, not because of the performances in the first game.”
He added: “Either we can adapt ourselves with the players we have or change. But we have to correct the situation with Spain.
“[Croatia] were superior to us but I thought our performance was positive,” he continued. “We knew we were a little bit inferior but without two or three situations it would have been 1-1.”
The Italian tactician also urged his players to believe in themselves, reminding them that they were deserving of a place at Euro 2012.
“I remember why we achieved this qualification,” he said. “I remember that we deserved it. We don’t have the great creative players but we have our own qualities and we have to keep believing in those.
"The players have to show their worth,” concluded Trapattoni.
Ireland have two remaining fixtures in Group C against Spain in Gdansk on June 14 and Italy in Poznan on June 18.