Real Madrid fear one of their key players will be banned by UEFA for the first leg of their Champions League quarter-final against Arsenal, according to reports.
The Spanish giants are due to travel to the Emirates next Tuesday, before hosting Arsenal in the return leg eight days later, but have been left sweating on the availability of four stars.
UEFA announced last week that they have launched an investigation into the behaviour of Kylian Mbappe, Vinicius Jr, Antonio Rudiger and Dani Ceballos in the aftermath of Real's penalty shootout win over Atletico last month.