Efe Ambrose's proposed loan move from Celtic to ChampionshipBlackburn Rovers is awaiting an English FA ruling over a work permit for the Nigeria defender.
The Scottish FA says the paperwork for the player who joined Celtic from Ashdod in 2012 was completed in time before the 23:00 GMT deadline.
But their English counterparts have different rules regarding work permits.
And the 28-year-old, who has played 51 times for his country, does not automatically meet the FA's criteria.