Cesc Fabregas
There's no denying that Fabregas' global fame stems more from his play with English side Arsenal than either Monaco or Barcelona, but he also made his name as a product of the club's famed La Masia academy. Between a pair of trophy-laden spells in England, the second with Chelsea, Fabregas spent three seasons in Catalonia, winning a La Liga title and impressing with Spain as well. Following his time at Stamford Bridge, he moved to Monaco, where helped the team reach the final of the Coupe de France in 2021, before retiring after a brief spell with Italian side Como.
Eric Abidal
After a brief stint in amateur football, Abidal made his professional debut with Monaco, but he struggled to find playing time and departed to Lille, then moved to Lyon where we won three league title and made his debut for France. His strong play there caught the eye of the Catalans, and he would play six seasons at the Nou Camp, the last curtailed by a serious medical issue. Following his release, he returned to Monaco for a single season on their promotion back to Ligue 1, before ending his career at Olympiakos in Greece.
Sonny Anderson
A Brazilian international, Anderson arrived in France with Marseille, where he was an instant hit but the club suffered administrative relegation. Moving to Monaco, he continued to average more than a goal every other match, and even helped the young side to the league title in 1997. With his fine form, Barça came calling, but despite winning a pair of La Liga titles, he was not often first choice, and returned to France, where he was instrumental in helping Lyon launch their run of seven league titles.
Thierry Henry
One of the all-time iconic players for both teams, Henry burst on to the scene at Monaco as a youngster, being a part of the 1997 title-winning side and helping France to the 1998 World Cup. After an ill-fated spell at Juventus, he moved to Arsenal, where he was an influential part of Arsene Wenger's teams before a run of three seasons in Barcelona saw him win every trophy on offer.
Rafa Marquez
Arguably the greatest Mexican player of all time, Marquez joined Monaco at the tender age of 20 in 1999, helping them to a league and Coupe de la Ligue title in his time there before joining Barça in 2003. Marquez would spend seven seasons in Spain, winning four league titles and two Champions Leagues before eventually retiring in 2018.
As illustrious as this list is, there are roughly a dozen other players who have turned out for both the Blaugrana and the Principality side, including the likes of Ludovic Giuly, Emmanuel Petit, Javier Saviola, Yaya Touré and Lilian Thuram. As the two clubs clash, one has to wonder if the next star to feature for both sides is in the squad of one or the other.
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