The Premier League will reportedly examine the paperwork of Benjani Mwaruwari's unsuccessful move from Portsmouth to Manchester City.
The Zimbabwe international striker was expected to join Sven-Goran Eriksson's side for an undisclosed fee in the latter stages of transfer deadline day.
However, the 29-year-old striker only arrived at City's training ground at 11pm and club officials were unable to complete the formalities of his move in time for the midnight deadline.
"Due to the late arrival of the player in Manchester, we were unable to complete the transfer," spokesman Paul Tyrrell told the club's official website.
Pompey boss Harry Redknapp was confident the deal would go through and signed Tottenham Hotspur striker Jermain Defoe as a replacement.
But the deal could now be resurrected by the Premier League should they rule in City's favour.
Earlier on deadline day, City did sign Ecuador striker Felipe Caicedo in a £5.2million deal from Swiss side FC Basel.