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.

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