Reports in England confirmed Fabio Coentrao has signed a loan deal with United after we missed out on Everton’s Leighton Baines.
The Real Madrid left back played 16 games in the league for them last season.
Real Madrid paid €30m for him two summers ago.
However, despite United’s claim the deal was done, Real Madrid are arguing it wasn’t finalised in time, after they missed out on securing the signature of potential replacement Siqueira. United submitted the transfer to the Premier League before the 11pm deadline but both clubs have to confirm the deal using FIFA’s TMS system.