One of the stands at the Parc des Princes will be opened for Paris Saint-Germain's violent ultra groups, in order that they can make the atmosphere as intimidating as possible for Real Madrid on Tuesday.
The club will authorise members of the Colectivo Ultras Paris (CUP) to enter the Boulogne stand (south), after having reintroduced them progressively into the Auteill stand (north).
L'Equipe indicates that the intention is help PSG turn around a 3-1 deficit in order to move forward in Europe, the main aspiration of the Qatari owners of the club.
Members of the CUP lit numerous flares in the French Cup against Marseille and were joined by a tier of ultras in one of the corners of the stadium, the so-called Block Parisii.
"Together we are invincible," and "Together we will achieve it," are slogans that the club are using on Twitter along with images of fans screaming and in some cases with flares.
"We have to be loud, deafening, they have eleven men, we eleven warriors and an army of voices that cry out in unison: together we will achieve it," a voice on an accompanying video remarks.
"The past is history, the future is ours."