The Catalan side's long-running bid to recapture their former youth team player - who left Barca as a 16-year-old to join the Gunners in 2003 - has dragged on for more than two years.
It has intensified this summer with the club seemingly determined to end the protracted saga but their attempts to bring the Spain international back to the Nou Camp have so far been rebuffed.
Arsenal boss Arsene Wenger has been critical of Barca's public pursuit of Fabregas and Zubizarreta, currently in Miami with Pep Guardiola's team, insists the European champions need to be "respectful" of the Gunners as they look to reach a deal for the 24-year-old midfielder.
Asked the current situation, he said: "We won't comment on the negotiations for Fabregas. We will have time for that.
"We must be respectful of the club Cesc belongs to. You just have to let things happen without being optimistic or pessimistic."