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FIFA has confirmed that it is carrying out an investigation into Manchester City's recruitment of youth players.
However, City have said they have no knowledge of the investigation and world football's governing body has not asked them to provide any information.
FIFA did not confirm details of the matters being looked at, with a spokesperson telling ESPN FC: "We can confirm that an investigation is ongoing."
A City source questioned whether the investigation was linked to an ongoing inquiry into the club's recruitment of Benjamin Garre.
City signed Garre, then 16, from Velez Sarsfield in September 2016, but the Argentine club claimed the move breached FIFA rules on the signing of players under 18 from outside the European Union.
FIFA ruled in City's favour because Garre holds an Italian passport, but Velez have taken the matter to the Court of Arbitration for Sport (CAS), with a decision expected this month.
Barcelona and Real Madrid have both been hit with transfer bans after being found guilty of violating FIFA rules on signing young players from overseas.
Atletico Madrid are unable to register new players until January 2018 after their appeal against a similar charge was dismissed by CAS.
FIFA confirmed this week that it is also investigating Chelsea over youth transfers.