Barcelona are one of the most successful clubs in football, especially since the turn of the century. Along with Real Madrid, the Blaugrana have the most trophies (91) of any club in Europe's top five leagues.In 2009, under the tutelage of a certain Pep Guardiola, Barcelona won a staggering six titles, which included the first-ever continental treble by a Spanish club and three other domestic and continental honours.Six years later, the Blaugrana became the first club in the history of the sport to win multiple continental trebles. Even though their fortunes may have dwindled since then - Barcelona endured a first trophyless season in 12 years last campaign - they remain a force to be reckoned with.First time since 2007-08 Barcelona finished their season with no trophy!La Liga ❌Copa Del Rey ❌Super Coppa ❌Champions League ❌After 13 years trophyless season 😳 pic.twitter.com/kTfhQBpchP— Football Factly (@FootballFactly) August 14, 2020Five players you didn't know played for BarcelonaConsidering the history and rich pedigree of Barcelona, some of the finest players in the sport have turned up for the club over the years.The likes of Johan Cryuff, Frank Rijkaard, Marco Van Basten, Ronaldo Nazario, Luis Figo, Ronaldinho, Xavi and Lionel Messi, to name a few, have donned the famed Barcelona jersey and etched their names in the club's folklore.However, a few other players enjoyed greater success elsewhere than they managed at Barcelona. On that note, let us have a look at five such players, in no particular order.#5 Mikel ArtetaMikel ArtetaCurrent Arsenal manager Mikel Arteta began his professional career at Barcelona but found first-team opportunities incredibly difficult to come by.After three years with the club's B-team, Arteta had stints at Paris St. Germain, Rangers and Real Sociedad before landing in the Premier League, where he blossomed into a fine midfielder.In over 350 cumulative games at Everton and Arsenal, the former Barcelona player flourished in a deep-lying playmaking role, scoring 51 times and providing 44 assists.In a later interview, Arteta revealed that he left Barcelona because he was behind in the pecking order and had little chance of breaking into the first team."I was playing in Barcelona and Guardiola and Xavi were ahead of me; it was a complicated situation. By that time I was 17 and Luis Fernandez called me from PSG to sign me. The next day I was already flying to Paris."#4 Juan Roman RiquelmeJuan Roman RiquelmeJuan Roman Riquelme, considered one of the world's finest playmakers when in his prime, weaved his magic at Boca Juniors and Villarreal but struggled to make much of an impact during his lone season at Barcelona.Riquelme had a largely underwhelming stint at Camp Nou, producing six goals and nine assists in 42 games, as he was played in an unfamiliar role in the wings by then-Barcelona manager Louis Van Gaal.G⚽️AL MORNING!!! Riquelme 🆚 Legia Warszawa pic.twitter.com/xhT7EJEOdj— FC Barcelona (@FCBarcelona) August 14, 2017A frustrated Riquelme showed only fleeting glimpses of his prowess on the ball before he left Barcelona to join Villareal, where he rediscovered his mojo.Former Barcelona player Hristo Stoichkov launched a scathing attack on Van Gaal for his handling of Riquelme, saying in this regard:"He did not succeed because of the way Van Gaal put him on the field. But even so, the first year in Barcelona, he also enjoyed a lot. I enjoyed his goals, passes, plays, stepovers, but when one comes who wants to invent one thing from something else, it's impossible."