Seven of Benfica's first-team squad are one yellow card away from serving a one-match suspension ahead of Tuesday's Champions League tie with Liverpool.
Any player who receives three bookings in Europe's elite competition is made to sit one match out as punishment and could result in some of Nelson Verissimo's key stars being missing for the return fixture at Anfield, should poor discipline be a feature of the first leg.
Spanish left-back Alex Grimaldo and former Manchester City centre-back Nicolas Otamendi are the two stars at highest risk of missing the trip to Merseyside as they aim to keep the Reds' ruthless attack at bay when the sides meet at the Estadio da Luz.
