Paulo Bento's side became the first team to reach the semi-finals of the tournament following Thursday's 1-0 victory against Czech Republic.
And the 70-year-old revealed he was misty-eyed after the match and admitted to being thrilled that the players were able to silence their critics.
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"I am a happy man thanks to these players, who played very well," Eusebio told RTP.
"They were being persecuted by the press, but we are in the semi-finals now.
"I would like to thank the players and the technical staff, because I know what they are feeling.
"After the match, I hugged Luis Figo and tears rolled down my face.
"We are not yet champions, but who knows? There are only two matches left."
The Euro 2004 runners-up will now lock horns with the winner of the quarter-final match between France and Spain, which takes place on Saturday.