Manchester United have been linked with the Barca midfielder, with United boss David Moyes thought to be keen to add to his midfield options.
The Cameroonian international has failed to live up to expectations in Spain, and could be tempted by a return to the Premier League where he played his best football.
He's still just 26-years-old but does not look likely to break into Gerardo Martino's team anytime soon. He has made just 11 appearances in the league so far this season.
Marca report that several Premier League teams are watching Song with a view to a possible move in the summer. Considering their reported interest in the player earlier this season, it's likely one of the teams is United.
The Daily Express reports that the other teams linked with Song are Arsenal and Manchester City.
Arsenal brought in Mathieu Flamini this season to replace Song in the defensive midfield position, while City have Fernandinho.
But Manuel Pellegrini's side may still be interested in Song after injury to Fernandinho exposed their weakness at the position.
Martin Demichelis was recently forced to play in midfield in his absence.
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