Coach boss Jesualdo Ferreira issued his threat ahead of tomorrow's Champions League clash in Portugal, knowing Kop boss Rafa Benitez was priced out of a swoop for the £20million-rated winger, 23, in the summer.
He said: "We have our weapons to decide the result. Quaresma is an important player in the big games and that's exactly what this is.
"He's motivated and ready to show how dangerous he is."
The cheeky Porto chief added: "I don't know if we will have to raise our game too much to win."