Quaresma signed for FC Porto in the summer of 2004 as Deco moved in the opposite direction for a fee of €15 million plus the former's playing rights, which were evaluated at the time at €6 million. He started the campaign on a high note by scoring the only goal in the win against S.L. Benfica in the Supertaça Cândido de Oliveira. also finding the net in the 1–2 loss to Valencia CF in the UEFA Super Cup.