The Brazilian international's current deal expires at the end of this season and the right-back has been linked with a move away from Spain in January.
Zubizarreta has said that Barca are in talks with the player, but no agreement has been reached.
"We've done nothing in that respect," he told AS.
"We're talking about the contract with him. We'll see what the road is we'll take. It's also influenced by the decision of Fifa [the transfer ban].
"The best thing is that we come to see an incisive Dani, that's important."
Alves has been strongly linked with a move to Manchester United.