Liverpool have been told they must wait to conclude the protracted signing of Javier Mascherano after the Premier League revealed they want to look into the transfer of the West Ham midfielder to Anfield.
The Argentina international was given special dispensation by FIFA to sign for the Reds despite already being registered with two clubs this season the Hammers and former side Corinthians of Brazil.
But despite Liverpool and West Ham agreeing a loan move for the out-of-favour midfielder and lodging the necessary paperwork with the Premier League prior to the closure of the transfer window on Wednesday, the deal is yet to be concluded.
"The Premier League can confirm that, in accordance with its rules, Javier Mascherano's registration documents were received from Liverpool prior to the transfer window closing," read a statement from the Premier League.
"While Liverpool have met the required deadline, the Premier League Board, consistent with its powers in this matter, has decided to take time to satisfy itself with the proposed arrangements before the registration can be effected and the player permitted to play for Liverpool.
"The board will consider the terms of the registration as quickly as possible and notify the parties involved of its decision accordingly."