The Spanish FA revealed the necessary paperwork for the completion of the deal had not been handed in before the deadline of 11pm in Spain.
However both the Red Devils and Real Madrid are claiming they filed their side of the paperwork before the deadline and the blame game has begun.
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De Gea has been Madrid's primary target throughout the summer and the Spanish giants are still doing their utmost best to complete a deal for the 24-year-old.
The Evening Standard revealed Los Blancos have lodged an appeal with FIFA to get the deal completed, however the only grounds for a successful appeal would be if Madrid could prove there was failure in the Spanish FA's administration.
THE BLAME GAME
An original £29 million plus Keylor Navas deal had been agreed for De Gea, and both clubs are keen to see the deal pushed through with both parties confident it was not their fault the deal failed at the last minute.
Some blame has been shifted on to Navas, who was stalling over a decision to be part of the player plus cash deal for the Spanish stopper.
However reports claim the Costa Rican is now annoyed the deal has fallen through after he was in line to double his wage to €4m-a-year upon moving to Old Trafford.
With the blame game well and truly underway, we are no closer to knowing what the future has in store for De Gea or Navas.