<P> Born and raised in central Argentina , Messi was diagnosed with a growth hormone deficiency as a child . At age 13 , he relocated to Spain to join Barcelona , who agreed to pay for his medical treatment . After a fast progression through Barcelona 's youth academy , Messi made his competitive debut aged 17 in October 2004 . Despite being injury - prone during his early career , he established himself as an integral player for the club within the next three years , finishing 2007 as a finalist for both the Ballon d'Or and FIFA World Player of the Year award , a feat he repeated the following year . His first uninterrupted campaign came in the 2008 -- 09 season , during which he helped Barcelona achieve the first treble in Spanish football . At 22 years old , Messi won the Ballon d'Or and FIFA World Player of the Year award by record voting margins . </P>
when did lionel messi play his first game for barcelona
October 2004