Barcelona will wear shirts with the words “Gracies Johan” across the chest when they play Real Madrid in the upcoming El Clasico.

The official mourning period of the club will end with the El Clasico.
The following is from the Club’s website.
“A mosaic of 90,000 cards shall bear the message ‘Gracies Johan,’ which shall be repeated on the shirts of the Barca players, where the world champions logo normally features.
Both teams will enter the field with children wearing shirts with the same message, ‘Gracies Johan,’ as well as the names of the Cruyff and FC Barcelona Foundations on the back.
The match will also be attended by all of the living former presidents of the Catalan club, namely Agusti Montal, Raimon Carrasco, Josep Lluis Nunez, Joan Gaspart, Enric Reyna, Joan Laporta, Sandro Rosell and Josep Maria Bartomeu.
The game will also be preceded by a minute’s silence in honour of Johan Cruyff, including the projection of a video tribute to the great man’s career”