Barcelona have reportedly been chasing the Frenchman's signature despite being contracted by Atletico until 2022, and the Madrid outfit decided to put an end to the transfer saga by taking it to world football's governing body.
"Barcelona have not negotiated with any player, so we understand that no irregularity has been committed," a Barcelona spokesperson told 'Marca'.
It all kicked off because of an unfortunate statement made by Barca director of sporting relations Guillermo Amor, who did not rule out an approach had been made for the French starlet.
The Catalans could face severe penalties if FIFA rule in Atletico's favour, including a potential transfer sanction.