La Liga rivals Real Madrid and Atletico Madrid have been banned from transferring players over the next two transfer windows, BBC has reported.

Both clubs will not be able to sign any players for the next two windows after FIFA punished them for breaching rules over the transfer of minors.  Neither club will be able to register a new player before the summer of 2017, however the ban does not apply to the current January transfer window.

Atletico were fined 900,000 Swiss francs (£622,000), while Real were told to pay 360,000 (£249,000).

An official FIFA statement read:

“The two clubs were found to have violated several provisions concerning the international transfer and first registration of minor players as well as other relevant provisions with regard to the registration and participation of certain players in competitions”

Real Madrid however said they will appeal the ban, and FIFA’s claim that they signed foreign players under the age of 18 is “inappropriate.”

An official announcement on the Real Madrid website said:

“Real Madrid will appeal this decision of Fifa in all the sporting incidents, considering them absolutely inappropriate”

Real Director General Jose Angel Sanchez was also furious with the ban, saying that he has “high hopes” of overturning the ban on appeal, and ban is “absolutely unjustified.”

Atletico Madrid was also taken by surprise by the ban and together with Real Madrid will appeal it. Atletico said:

“Our club is not in agreement with the sanction from international football’s governing body and will study all the documentation we’ve received to present an appeal against the sanction.”

The ban leaves David de Gea’s future on hold, after a deal almost went through with Manchester United last summer. Gareth Bale and Cristiano Ronaldo have also been linked with Manchester United, and any plans of shifting clubs will be seriously affected by the ban.