As a child, Leo developed his passion for football playing games with his brothers and cousins in the streets of Rosario, Argentina. He later honed his skills on the pitch as part of the local youth team, Newell's Old Boys – who famously won every tournament whilst Leo was with them. But life wasn't without its challenges. Aged 9, he was diagnosed with Growth Hormone Deficiency, which meant he had to inject himself with hormones from the doctor every day to help him grow. But nothing was going to stop Leo from following his dreams. He debuted with FC Barcelona in 2004 and across the next 17 years scored 672 goals for the club and helped them to win 35 trophies.