La Liga officials have reportedly told Sky Sports that they did not receive any paperwork whatsoever regarding the transfer of David De Gea.
It was initially reported that the deal had stalled because documents had arrived late, supposedly 28 minutes after the Spanish transfer deadline last night.
However, it is now suggested that the governing body received nothing from the Spanish giants confirming that the Spaniard had been added to their squad.
Both Real and United are expected to appeal to FIFA in a bid to push the deal through in order to allow De Gea to complete his move which in turn would see all concerned parties happy.
While it is assumed that they will ultimately be successful, it is claimed that La Liga have already made clear that they will not be backing the appeal which in turn would suggest that it is certainly set to fail.
United have informed Sky Sports that they signed and delivered all the relevant documentation in time, and that they have evidence to prove it.
As a result, the blame falls purely on the door of Real who had agreed a £29m fee for De Gea, plus Keylor Navas moving in the opposite direction.
However, United may now have to prepare for the possibility of their first choice goalkeeper staying in Manchester to see out the final year of his contract.