Manchester United will be unable to sell goalkeeper David de Gea to Real Madrid as they planned unless FIFA rules that the paperwork was filed on time.
According to Goal, both teams are keen to revive the deal, which involves de Gea being sold to Bernabeu for £29m and goalkeeper Keylor Navas.
Man United insist that they sent their paperwork to Real Madrid through fax on time.
They have been ruled to have done so a minute past the transfer deadline, which puts both teams in danger of losing out on this deal.
De Gea has been eager to transfer to Real Madrid and return to his home country, but it appears that he will may have to spend one more year at Old Trafford.
The 24-year-old Spanish international has one year left on his Man United contract.
A rift has reportedly been created between De Gea and manager Louis van Gaal, however, and Sergio Romero has been preferred as first-choice shot-stopper this season.
FIFA will review the ongoing confusion, and they are expected to make a ruling on the deadline snafu within the next day.