This autumn's violent protests in Catalonia caused the El Clásico meeting between the Spanish football giants Barcelona and Real Madrid to be postponed.
The new match date was set instead of December 18, and now it is clear that the safety challenge will be at the top in connection with Wednesday's hit.
The Democratic Tsunami protest group, which is trying to get a new referendum on Catalonia's independence, has urged its supporters to gather outside the Camp Nou arena from four hours before kick off.
For this reason, the Spanish police, the two clubs and the Spanish Football Federation, RFEF, have convened for the match to ensure that both players and referees as well as the expected support crowd of almost 100,000 people can arrive safely at the stadium.
A security staff of as many as 3,000 will attend the classic meeting to prevent protesters from blocking the entrances to Camp Nou.
"It will guarantee that El Clásico is played as usual," said Eugeni Sallent, head of the Catalan police department.
Originally, El Clásico would have been played on October 26.