"FIFA has taken note of the award by the Court of Arbitration for Sport (CAS) in the case involving the club Chelsea FC, which was sanctioned by the FIFA Disciplinary Committee for breaches relating to the international transfer and first registration of players under the age of 18," said a FIFA spokesperson.

"Despite the reduction of the original sanction, FIFA takes note that CAS has confirmed a breach of the regulations on minors and the imposition of a transfer ban and a fine.

"FIFA is now waiting to receive the grounds of the decision in order to fully analyse it."

Chelsea reacted to the CAS findings by branding elements of FIFA's approach "perverse", warning that the global governing body risks undermining itself through "inconsistent and unequal sanctions".

Manchester City avoided a FIFA transfer ban in August despite being found guilty of breaching rules on youth signings.

"The approach taken by FIFA to this case has been deeply unsatisfactory, not least as FIFA chose to treat Chelsea entirely differently to Manchester City for reasons that make absolutely no sense to Chelsea," read a Chelsea statement.

"Chelsea respects the importance of the work undertaken by FIFA in relation to the protection of minors and has fully cooperated with FIFA throughout its investigation.

"However, if FIFA continues to impose inconsistent and unequal sanctions on clubs then it will not only undermine the very purpose of the regulations, but it will also bring into doubt the game's confidence in FIFA being able to appropriately regulate this important area."