Fabregas was 15 after he left Barca's youth system, has sparked a flurry of new rumours with his comments, which suggest he is considering quitting the Premier League.
'If I decide to leave Arsenal, it will be to wear the shirt of Barcelona. I don't know when this will happen though,' Fabregas told Spanish newspaper Marca.
'I want to make a decision about my future before the start of the World Cup. It's impossible to perform at a tournament like the World Cup if you're not fully focused on the sporting aspects of the game.
'I don't want to be distracted by transfer talk.'
Fabregas also admitted it would show 'a lack of respect' to discuss moving to Barcelona while the battle for Spain's Primera Liga title is ongoing, and he rejected talk of being little more than a pawn in the upcoming FC Barcelona presidential election.
'Barcelona are still playing for the Liga title and I'm still an Arsenal player,' he continued.
'No candidates for the Barcelona presidency have approached me, so I don't feel used.'
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