Status quo: Deals that could be affected by FIFA's ban on Madrid clubs

FIFA's transfer ban on Real Madrid and Atletico Madrid has put both La Liga clubs in a position Barcelona knows too well. The Blaugrana served a similar sanction last year for violating rules pertaining to the dealing of minors, and although they did capture Arda Turan and Aleix Vidal, there were significant sacrifices made by both players. Neither could feature for Barcelona for months, and had to train by themselves.

Madrid and Atletico would be lucky to make such high-profile signings in the next two windows, during which they are not allowed to register any incoming players.

Related: Real Madrid, Atletico Madrid banned from transfer market until 2017

But the ban may also affect the players both sides may have otherwise allowed to leave. Unable to replace potential starters looking for a new adventure, the Madrid teams wouldn't want to face a 2016-17 season without suitable replacements. Both sides could still call back their own players on loan, but in doing so there lies a risk of inexperience.

They have each decided to appeal the ruling, and that could delay the application of the ban. Barcelona, after all, brought in Luis Suarez as it fought charges against FIFA. Madrid and Atletico also have the option of blitzing the market in the current transfer window before the embargo kicks in.

Here are some of the deals and players from both clubs who might end up being left in the lurch as a result of Thursday's news:

Real Madrid

Alvaro Morata: Madrid could have moved to re-sign Morata from Juventus in the summer, when its €35-million buy-back option for the 23-year-old is set to become active. The option is only valid in the coming summer window, however, meaning Madrid would have to forfeit that clause should the ruling stand. Morata already extended his contract with Juventus in December, confirming his intention to remain with the Serie A club.

Cristiano Ronaldo: Various reports indicated that Madrid had been considering shopping Ronaldo in the summer and starting a new era, even before the firing of Rafa Benitez. Ronaldo's contract with Los Blancos runs until 2018, one year after the ban expires. Though his agent has insisted that he will retire in Madrid, he continues to be linked with former club Manchester United, Paris Saint-Germain, and Major League Soccer. But Madrid would most likely keep Ronaldo until at least 2017 if it cannot bring in another Galactico.

David De Gea: The deadline-day debacle that scuppered De Gea's move to the Spanish capital may have ultimately robbed Madrid of its only chance to sign the 25-year-old goalkeeper. The consensus was that Madrid would re-open negotiations with Manchester United at the end of the season, but FIFA's ban would not allow that to happen. Unless Madrid delays the implementation of the sanctions and gets one more transfer window in which to operate, De Gea will likely stay put.

Isco: Isco started in Zinedine Zidane's first match in charge of the side, a 5-0 win over Deportivo la Coruna. It was a vote a confidence from the new manager, who has compared the 23-year-old midfielder to himself. But there remain questions around playing time, and whether Madrid can offer Isco the minutes he needs before Euro 2016. Several clubs ranging from Juventus to Chelsea have reportedly expressed interest in Isco, who has struggled to maintain a spot in the starting XI since joining Madrid in 2013 from Malaga. Madrid may be inclined to retain the Spaniard while the ban plays out, or they could elect to replace him with a youngster if he is strictly a bench player in Zidane's mind.

Atletico Madrid

Diego Costa: The Spain international has suffered through one of the worst seasons of his career at Chelsea, scoring just six Premier League goals in 17 appearances, while reportedly thinking about moving back to Atletico. Filipe Luis made a similar return last year, ditching Chelsea to reunite with Atletico. The Spanish club could use Costa, considering the failure of €35 million signing Jackson Martinez to score on a consistent basis. The ban doesn't suit either party, with the possibility of a transfer over the next 18 days appearing unlikely.

Antoine Griezmann: Before the ban was announced, Atletico had already been prepared to increase Griezmann's release clause to €100 million in an effort to ward off interest from foreign suitors. He is one of Europe's hottest commodities, having been linked with Chelsea, Manchester City, and Bayern Munich, but the sanction would undoubtedly solidify Atletico's strong position over the 24-year-old Frenchman.