The Brazil international is a reported target of City boss Sven-Goran Eriksson with former Heerenveen striker Georgios Samaras being lined up as a possible makeweight in the deal.
But Kuiper was remaining tight-lipped when quizzed on the matter on Thursday, telling the club website: "Obviously the rumour machine concerning Alves has come on at a pace. Our policy is that we do not react to rumours and that will remain this way."
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