Velez Sarsfield have lodged a complaint with FIFA, claiming that Manchester City 'acted immorally' when they signed Benjamin Garre from the Argentine club during the last transfer window.
The 16-year-old midfielder made the switch to England in July after City acquired his prized signature ahead of Manchester United and Barcelona.
But El Fortin president Raul Gamez alleges that the Citizens initially made an offer for Garre when he was 15 – a clear breach of FIFA regulations put in place to prevent the exploitation of non-EU minors by European teams.
"Never have I experienced such an immoral act," Gamez was quoted as saying by the Daily Telegraph.
"They [City] offered money to take a 15-year-old child who is in the middle of his stage of development. We don't know what they offered the father and the child in order to convince them."
The Eastlands outfit have reportedly denied the allegations, stating that world football's governing body ratified the transfer and the fact that the teenager holds an Italian passport meant City were allowed to sign him when he turned 16.
Gamez, who added that his club would even take their case to the Court of Arbitration for Sport if need be, blamed the Argentina FA for the loss of so many youth players at Estadio Jose Amalfitani.
"We had a youth player stolen from us. While AFA keeps messing around, we will continue to be without protection," he said.