The presence of Lionel Messi in Wednesday night's Clasico at the Camp Nou is the great unknown aspect ahead of the game.
In Saturday's game against Valencia, which the Blaugrana drew 2-2, the Argentine exited early through injury and put his participation against Real Madrid in doubt.
SEASON 05/06: BARCELONA 1-1 REAL MADRID
Barcelona went ahead in this one with a penalty from Ronaldinho. Before the break, Ronaldo levelled things and no further goals arrived in the second half. Barcelona arrived with the advantage in the title race and went on to win it. That was the year in which the Blaugrana won 3-0 in the first round of fixtures, a game which caused the Bernabeu fans to applaud Ronaldinho.
SEASON 07/08: BARCELONA 0-1 REAL MADRID
The Day of the Beast at the Camp Nou. Real Madrid provided some pre-Christmas cheer for fans with a 1-0 win thanks to a Julio Baptista strike. Real won the second meeting that year 4-1.
SEASON 18/19: BARCELONA 5-1 REAL MADRID
Messi's most recent injury absence came in a Clasico in which he wasn't missed much. The Blaugrana put five past Los Blancos, in a game that cost Julen Lopetegui his job.