The 20-year-old left the Blaugrana for the Champions League winners in the summer of 2011, but the Catalans have an option to re-purchase Romeu for a set fee.
"Returning to Barcelona is an option. Barca have a buy-back option. I left the club knowing about that. If they want to use that option, they should let me know," Romeu was quoted as saying by Sport.
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"If Tito [Vilanova] wants me to join, I'll talk to him and I'll consider it. If they show they believe in me, I'd be fine with that.
"I've always been a big fan of the club. Thanks to them I am where I am now, but playing time is crucial."
Barcelona are supposedly keen to add some more depth to their midfield following the departure of Seydou Keita earlier this month, and Romeu could be one of the candidates to fill the void.