"Som I Serem" ("We are and will be") - the message that will also greet Milan tonight
Ninety-thousand placard-waving fans will seek to intimidate AC Milan in the second leg of Barcelona's Champions League last-16 tie on Tuesday night.
The Catalan club's fans are famous for their 'mosaics' - here is a selection of the best pictures of the Blaugrana faithful in action.
Real Madrid's welcome ahead of a Clasico this season
Fans hold "Estelada", the flag of Catalan independence, before a Clasico last year
Barcelona and AC Milan ahead of their meeting in 2006. The match ended 0-0 and Barca won 1-0 on aggregate
Barca's fans wave flags before the Champions League semi-final second leg last season, which saw Chelsea progress to the final
Celebrations after Barca's first title for six years in 2005 under Frank Rijkaard
"Mes que un club" ("More than a club") - the Blaugrana's motto, also written in the seats
Barca would lift the Champions League trophy for the second time in their history and first time since 1992 after beating Milan in this semi then Arsenal in Paris
The club logo, featuring the red cross of St. George, the flag of the city of Barcelona; the red and yellow stripes of the Senyera, the Catalonian flag; the club's colours; and a football
Thanking Pep Guardiola when he left following an incredible period of success
More mosaics...
And this is what all Barca's fans would like to do to Leo Messi
