Arsenal are sweating on their proposed £30million move for Shkodran Mustafi after the switch hit complications.
Valencia want £30million for the Germany international, but the Gunners value the centre-back nearer to £20million.
The Spanish club are adamant they won't let the player leave for anything less than their valuation, though talks between both clubs are ongoing with Arsenal still hopeful of concluding a deal in the coming days.
But, as well as the haggling over a fee, there has been confusion over the agents involved in the deal leading to further delays in the move.