It's only Wednesday and already I've had several queries about tickets for Saturday. The situation as I understand it is this: the Ultras (South) stand is almost sold out and tickets may be all gone by now. My home in the n-zone (North Stand) is about 70% sold. The East and West stands usually sell a tad slower as the price is higher and the atmosphere quieter but of course the view is better. I don't know how many tickets they have left for those stands.
Occasionally the club reserve a quota of tickets to sell on match day but I suggest not taking the risk. Tickets should be available from the usual outlets.