#1 Lionel Messi
Every ounce of success Barcelona have achieved over the last decade has been made possible in no small measures by Lionel Messi. The Argentine's mercurial ability means that he has the means to decide matches on his own almost single-handedly.
Despite turning 32 over the summer, Messi has shown no signs of slowing down and is still the singular most important player in Barcelona's history 15 years after making his debut.
With 603 goals and 242 assists in all competitions for Barcelona, the Rosario native is the club's runaway leader in both categories, and with 34 trophies lifted at Barcelona, Lionel Messi is the most decorated player in the club's history.
He is one of only a handful of players to have won two trebles, and four years after inspiring Barcelona to a second treble in 2015, Lionel Messi would be raring to go once again once he returns from injury.