Turkish prosecutors charged Arda Turan with sexual harassment, unlicensed possession of weapons and causing intentional injury over the fight with singer Berkay Sahin.
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Arda Turan has not trained recently, while Busquets and Iniesta were absent from a training session in the past two days.
Barca coach Luis Enrique may not include Busquets, Iniesta and Turan in the line-up for Wednesday's match against Bilbao. Jordi Alba, who is still recovering from a muscle injury to his right leg, may also miss the game.
Arda Turan's second half goal helped Atletico Madrid win despite Juventus dominating possession.
Real Madrid's second straight loss left it four points behind the defending champion, and six points adrift of Barcelona after it beat Athletic Bilbao 2-0 earlier thanks to Neymar's brace.