Barcelona fans have displayed Catalan flags as a symbol of regional pride for many years.
And during the Champions League final against Juventus, the Catalan supporters displayed an array of red and yellow regional flags during the Champions League final in show of pro-independence sentiment.
The northeastern region of Spain recently held a referendum in which Catalan voters revealed their desire for independence with majority of the population voting for separation from the Spanish state.
After their success in the 2014/2015 Champions League final, the league's governing body has decided to launch a disciplinary hearing against the club.
UEFA's laws have banned "symbols, actions or songs that are not within the context of a sports event, especially messages of a political, ideological, religious, offensive, and provocative nature."
If found guilty of violating UEFA's code of conduct, the Catalan club faces a heavy fine and a partial stadium closure.
"A disciplinary proceeding has been opened against FC Barcelona for illicit banner use and chanting," a UEFA spokesman announced.
"The case will be decided during the next control, ethics and disciplinary meeting on July 23."
This referendum was publicly backed by FC Barcelona and was opposed by the Spanish government.
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