As revealed by the BBC this morning, Premier League giants Chelsea and Manchester City are both being investigated by global football's governing body FIFA, regarding their recruitment of young players.
City, meanwhile, found themselves on the end of a £300,000 Premier League fine in May and were also banned from signing academy players for two years.
A City source questioned whether the investigation was linked to an ongoing inquiry into the club's recruitment of Benjamin Garre.
Chelsea were also investigated last year over the signing of Bertrand Traore after images emerged of him playing for the club as a 16-year-old, before worldwide clearance had arrived.
Their family must either be relocating for non soccer reasons to the country where the new club is based, they must live no further than 50km from a national border and the club with which the player wishes to be registered with is within that 50km radius, or if they sign between the age of 16-18 the new club must provide them with housing, access to education and a soccer education.
Federation Internationale de Football Association cleared City of Sarsfield's allegation that they were not allowed to sign the player because of his nationality, on the basis Garre had an Italian passport.
Real had the sanction halved on appeal but Atletico had theirs upheld by the Court of Arbitration for Sport. A hearing was scheduled for July but a verdict has not yet been delivered.
Both clubs are in the European Union or European Economic Area and the player is aged between 16 and 18.