That's according to fresh reports in Spain today that claim the former Premier League star has grown frustrated at the lack of opportunity at the Nou Camp.

Song made only his third start of the season this weekend in a 4-1 victory against Valladolid with Catalan paper Sport comparing his form to be improving towards how he played for the Gunners.

Barca team-mate Sergio Busquets is currently favoured over the 26-year-old and could lead to his departure from the reigning La Liga champions in January.

Manchester United are also said to be keen to snap up the defender during the winter transfer window but are having to wait to see if Barca are willing to risk letting him leave.