Porto president Pinto da Costa cannot rule out selling star striker Hulk this month.

Chelsea, Real Madrid and PSG have all been linked with the Brazilian in recent weeks.

"You know he has a buyout clause of €100 million, but I am convinced that in Europe there are clubs that can afford this. That does not assure his permanence," confessed Da Costa.

Gus Fonseca, a representative of Hulk, also admitted: "We cannot give certainties about anything. Let's wait.

"Hulk is one of the biggest players in the world, it would be unrealistic to say he could not leave.

"The Chinese have clubs paying €10 million per year, Russian clubs reach €20 million in wages per season. Therefore, I cannot say that a clause of €100 million is over the top."