Manchester United are reportedly planning to step up their pursuit of Arsenal defender Thomas Vermaelen.
The former Premier League champions are expected to strengthen their defensive options following the departures of Nemanja Vidic and Rio Ferdinand.
While Borussia Dortmund's Mats Hummels has been named as a potential target, it is understood that United will double their initial bid of £6m in order to land Vermaelen, according to The Express.
The 28-year-old, who has returned from the World Cup in Brazil after Belgium were knocked out by Argentina in the quarter-finals, has one year remaining on his contract with the Gunners.
The player himself has stated that he is unaware if his future lies at the Emirates next season.
Recent reports have stated that Arsenal manager Arsene Wenger is keen to find a replacement for Vermaelen before allowing a move to Old Trafford.
It is believed that Newcastle United full-back Mathieu Debuchy is poised to join Arsenal after reportedly completing a medical earlier this week.
