Barcelona coach Tata Martino won't stand in the way of Alex Song should he seek a move in January.
The Cameroon international is unsettled at the Nou Camp after failing to nail down a regular start under Martino this season. Song was an 89th minute substitute in last night's Champions League win at Celtic.
A return to England is likely for the former Arsenal midfielder, with Manchester United favourites for his signature.
AC Milan are also keeping tabs on his situation.
