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Leicester City's transfer deal for Adrien Silva has hit problems with FIFA failing to sanction the £22million deal.

The move for the Sporting Lisbon midfielder took place in the last minutes of deadline day as Danny Drinkwater moved to Chelsea in a £35million transfer deal.

Leicester City said tonight they were "working to overcome some issues and trying to find a resolution."

The club are said "to be working with Adrien and Sporting Clube de Portugal to overcome some issues relating to the player's registration."

It is understood that although the international clearance has not been sanctioned by FIFA, the deal is not dead.

City and Chelsea both needed a two-hour extension on transfer deadline day as paperwork for the Drinkwater and Silva deals still needed to be completed as the 11pm deadline came and went.

They had a two-hour extension and the deal was confirmed by the Premier League, but still needed international clearance.

(Image: YURI KADOBNOV/ AFP/Getty Images)

International clearance is a FIFA regulation for a player moving countries.

In Silva's case, the Portuguese FA would be responsible for issuing an International Transfer Certificate and this can only happen for transfers during the recognised transfer windows.

After the certificate is issued, the FA in this country is obliged to accept the document and register the player.

It would, therefore, seem that in the Silva case that the issues lie in Portugal and will need sorting out in Lisbon.

Silva has already said his goodbye to his former team-mates at Sporting after he returned to the training ground on Monday following his international duty with Portugal.