Barcelona have asked the Catalan government about possible postal voting after having to delay their presidential elections.
Real Madrid's game at Osasuna was a forgettable affair but Zinedine Zidane questioned why the match went ahead.
Lionel Messi is into the final six months of his contract at Barcelona but Pep Guardiola would not be drawn on his former star pupil.
Osasuna were rarely threatened by a toothless Real Madrid in a forgettable LaLiga clash at El Sadar.
Barcelona slumped to their worst away run in LaLiga since May 2008 after suffering a 2-1 defeat to Cadiz.
Sevilla paid tribute to former captain Marcelo Campanal before the game, and goals from Lucas Ocampos and Fernando delivered a derby win.