Arsenal in a transfer war with Manchester United about getting Mats Hummels services

Arsenal are ready to challenge Manchester United for German centre-half Mats Hummels.

So far United have failed to agree a fee with Borussia Dortmund for the World Cup winner, with the German club wanting a sum in excess of £25million.

Arsenal, though, could come up with the cash after the sale of Thomas Vermaelen to Barcelona on Saturday.