Earlier this week, Barcelona were unexpectedly knocked out by Eintracht Frankfurt in the Europa League.
The framing around the match was noticed, as it was the visiting German fans who dominated the stands.
Up to 30,000 Germans are said to have been present at the Camp Nou.
When Barcelona again played at home, in the league against bottom team Cadiz on Monday, the club's fans showed their dissatisfaction by completely boycotting a section behind one goal.
- Too bad they did not show up tonight, because we needed them, says coach Xavi.
Fell again
The fans who showed up saw a new failure.
Barça fell shockingly with 0-1 against Cadiz after a weak effort.
- We have to analyze what we are doing wrong and change the momentum as soon as we can, says Xavi after the match.
Real Madrid now leads La Liga with 15 points ahead of second-placed Barcelona.