Liverpool could be ready to step up their interest in Javier Mascherano after contacting Fifa regarding his availability.
It is presumed Mascherano cannot leave West Ham during the January transfer window as he has already played for The Hammers and Corinthians over the past 12 months.
Fifa rules permit any player turning out for more than two clubs over a one-year period between 1st July and 30th June the following year.
However, Liverpool, who are believed to be heading the queue for the Argentine's services, have contacted Fifa with a view to ascertaining whether they might permit a third move.
The 22-year-old is currently out of the first-team picture at Upton Park and is reportedly keen to secure a move away from the East Londoners in search of first-team football.
"We have received correspondence from Liverpool and a case has now been opened," confirmed a Fifa spokesman.