Dean Huijsen, Alvaro Carreras, and Aurelien Tchouameni are all one yellow card away from an automatic suspension for the return leg. Huijsen and Tchouameni currently have two yellow cards each, while Carreras has four.
The trio, all regular starters, will face Benfica in tonight's first leg at Estadio da Luz and must avoid receiving another caution to remain available for the decisive second leg at the Santiago Bernabeu.