The FA want the Anfield club's latest recruit to play for England, after it emerged he is eligible to play for Roy Hodgson's side.
Ilori - who was born in London - has represented the Portuguese national team at junior level throughout his career with Sporting.
England chief odgson and newly-appointed Under-21 coach Gareth Southgate fear there is a lack of talent making the breakthrough in the Barclays Premier League, and have turned to Ilori in a bid to solve England's lack of options in defence.
It is a subject that will be addressed when new FA chairman Greg Dyke makes a strong speech on the issue on Wednesday.
England were alerted to the possibility that Ilori could be persuaded to switch nationality after his move to Anfield.
Ilori, 20, was also wanted by Tottenham, but the move was blocked and he decided to move to Liverpool instead.
Brendan Rodgers has been busy on transfer deadline day so far, with Ilori, Victor Moses and Mamadou Sakho all completing moves to Anfield, whilst reports continue to link Shay Given with a Liverpool switch ahead of the 11pm deadline.
The deals are a further boost to Liverpool, who sit top of the Premier League table following three successive 1-0 wins, the latest coming at Anfield on Sunday, beating David Moyes' Manchester United.