Luis Enrique has warned his Barcelona players not to let angry after they reacted furiously to their Copa del Rey defeat to Athletic Bilbao, with Gerard Pique reportedly facing a ban over his post-match comments.
Barca left San Mames with a 2-1 defeat in the first-leg fixture, which saw Athletic reduced to nine men in a clash overshadowed by the performance of referee David Fernandez.
Raul Garcia and Ander Iturraspe were shown second-half red cards, but Athletic strike Aritz Aduriz escaped punishment for striking Samuel Umtiti in the throat, while Barca were further enraged when Neymar was denied a certain penalty.