£15m summer signing could make exit already.
Arsenal could re-sign Thomas Vermaelen on loan this January in a shock deal as Barcelona already look ready to part ways with their failed summer signing, according to the Daily Express.
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The injury-plagued Belgian international is yet to make an appearance for his new club after his £15m summer move, and Manchester United could also revive their interest in a player they tried to sign in pre-season.
Both Arsenal and United are short of defensive options, with the Gunners failing to replace Vermaelen after his departure, leaving Nacho Monreal to play out of position at centre-back.
United have also been linked with the likes of Jan Vertonghen and Ron Vlaar as Louis van Gaal seeks new additions to his back four.