The Spanish giants are focusing all their attention on beating Manchester United in the European showpiece at Wembley a week on Saturday.
But within hours of the final, Barca chiefs could make their move to finally prise Fabregas away from Arsenal.
Familiar faces: Cesc Fabregas (left) and Barca's Lionel Messi on Champions League duty earlier this season
If they lift the trophy at Wembley, any deal may be delayed, but should United triumph, Barca are expected to trigger negotiations the very next day.
According to Spanish newspaper El Mundo Deportivo, Barca will offer ?26.5million - plus a choice of two fringe players.
It is the latest attempt to sign the player who left them as a teenager to join the Gunners.
Since then, Fabregas has matured into one of Europe's leading midfielders as well as becoming Arsenal's captain.
Gutted: Fabregas comes to terms with losing to his boyhood heroes in Europe's premier club competition
The Spain World Cup winner was close to leaving the Emirates last season before Arsene Wenger persuaded him to stay.
But there are fresh fears that Fabregas - who is out of Sunday's final Barclays Premier League match with Fulham - has now played his last game for Arsenal.
On Thursday, Wenger vowed to battle to keep Fabregas at the Emirates.
What next? Fabregas waves to the Arsenal fans after the final home game of the season last week
He said: 'I expect him to be here, and I will fight very hard to keep him here. You have always to fight when you have a player of that quality. You must always fight to keep your players.'
Wenger warned his stars the grass might not necessarily be greener away from Arsenal.
He said: 'What guarantees you that if you go somewhere else you will win trophies? The biggest pride for a captain is to be committed to his club and deliver trophies with his team.
'A player who changes his club every time he is frustrated or when he doesn't win a trophy, goes nowhere. I believe the quality of sports life is to be committed to your club and not just to move out when it does not go as well as you expected.'
One option: Gunners boss Arsene Wenger is a fan of Barcelona defender Thiago Alcantara
Barca, widely regarded as the best club team on the planet, are keen to have Fabregas alongside Xavi and Andres Iniesta in their engine room.
The 24-year-old has made no secret of his desire to one day play for Barca and this could well be the summer when that wish comes true.
Arsenal will demand around ?45m for Fabregas. That is a figure Barca will refuse to match, although they are ready to supplement their offer with a choice of players.
Wenger is believed to be an admirer of central defender Thiago Alcantara but he is expected to be out of reach. As is Bojan Krkic, who may be involved in a swap deal with Villarreal striker Giuseppe Rossi.
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