Atletico Madrid have been fined €46,200 by FIFA for breaching regulations regarding third-party involvement.
The La Liga club were punished and warned about their future conduct by FIFA's Disciplinary Committee, following an investigation.
It comes a year after Atletico were given a two-window transfer ban due to irregularities involving the signing of underage players from overseas.
"The FIFA Disciplinary Committee has sanctioned the club Atletico de Madrid, Spain, with a fine of CHF52,500 [€46,200] and a warning for breaching art. 18bis of the Regulations on the Status and Transfer of Players (2014 edition), as well as Annexe 3 of said regulations," FIFA said in a statement.