Two of Spain's top clubs have lost appeals over transfer bans.
Real Madrid and Atletico Madrid have been punished for breaching rules over the transfer of minors.
FIFA says they can't register players during the next two transfer windows.
In a statement football's world governing body said: "The FIFA Appeal Committee has decided to reject the appeals lodged by Spanish clubs Atlético de Madrid and Real Madrid and to confirm in their entirety the decisions rendered by the FIFA Disciplinary Committee in the respective cases relating to the protection of minors.
"As such, both clubs are to serve a transfer ban that prevents them from registering any players at national and international level for the next two complete and consecutive registration periods for breaching articles 5, 9, 19 and 19bis as well as annexes 2 and 3 of the Regulations on the Status and Transfer of Players (the “Regulations”). The transfer ban applies to each club as a whole – with the exception of the women’s, futsal and beach soccer teams – and does not prevent the release of players.
"Additionally, Atlético de Madrid and Real Madrid have been fined CHF 900,000 and CHF 360,000 respectively, while both clubs have been issued with a reprimand and a warning and given 90 days in which to regularise the situation of all minor players concerned."
Real say they will appeal to the Court of Arbitration for Sport.
Barcelona served a transfer ban in 2015 summer and winter windows.
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