Spanish Federation has rejected Catalans' appeal against Brazilian's three-game ban.
Catalans return to training after Champions League elimination at hands of Juventus.
Raphael Varane and Pepe are the only two players in Los Blancos' treatment room.
Barca were beaten 3-0 on aggregate by Juventus in the quarter-finals of the Champions League.
Veteran goalkeeper is on a season-long loan from AC Milan.
Manchester City, Chelsea, Juventus and Barcelona had been linked with his services in recent months.
The 19-year-old Carles Aleña promoted from second team to replace Tukish international.
Spanish legend refused to commit his long-term future to the Nou Camp.
Jérémy Mathieu also back in workouts after missing the Sunday's training session.
Former Tottenham star suffered a calf injury during the 2-1 win over the Bundesliga giants last week.
Antoine Griezmann and Romelu Lukaku are also wanted by United's league rivals Chelsea.
Morata has confirmed an interest in playing under Chelsea boss Antonio Conte.
The 21-year-old Belgian has also talked up moves to Atletico Madrid and Sevilla.
Bale picked up an injury during Real's 2-1 win over Bayern Munich.
Portugal international, Nacho, Jordi Alba and Sergi Roberto are a booking away of missing El Clasico.
Catalans also looking to part ways with former Valencia defender Jeremy Mathieu.
Foxes lost the first leg of their Champions League quarter-final 1-0 to Atletico Madrid.
Alcantara and Vidal are also ruled out while the game could still come too early for Turan.
David de Gea was close to completing a move to Real Madrid in 2015.
Dybala has scored 16 goals and assisted a further eight in 36 games in all competitions for Juventus.
Former Atletico Madrid star has missed the last four games due to a groin injury.
Barcelona lost 3-0 to Juventus in the first leg of the Champions League quarter-final in Turin.