Reports in Spain said Barca had agreed a deal to pay 10million euros in advance in order to have the right to conclude a transfer for the 19-year-old before 2014, with Santos forced to pay financial penalties if they choose not to sell the player before that date.
But at a press conference on Wednesday, Barca spokesman Toni Frexia refused to be drawn on the question.
"What we do is communicate agreements when they are finalised," he said. "We also respect that the player is a member of another team, Santos, so we have nothing to say.
"I don't explain things that we are doing until they are done."