A rock solid defence will come up against one of the globe's best attacks on Wednesday night at the Camp Nou as Barcelona's MSN attempt to breach the impenetrable wall of Juventus' BBC.
Of course, the Blaugrana are more used to the Real Madrid variety of the acronym - which they will face on the weekend - but first up are Gianluigi Buffon, Leonardo Bonucci, and Giorgio Chiellini.
Lionel Messi, Luis Suarez, and Neymar know that their 3-0 aggregate defeat in Turin requires every opening to be taken in the return game, and chances are expected to be minimal.
For Messi, in particular, the Argentine knows that individual silverware often follows collective glory and that a world class performance against Juventus is a must for his Ballon d'Or hopes.
And the Italians are the stingiest side in Europe this season, conceding just twice all campaign, a figure Barcelona must more than double to have a chance of reaching the final four.
Alongside the central defenders will be Dani Alves and Alex Sandro, two wing-backs known for their attacking athleticism but tasked with quelling the Azulgrana on Wednesday night.
All of these top class players can have a say on who goes through to the semi-finals, with the onus on the Juve goal going into the second half of this titanic, but so far one-sided, battle.
