 During the 2003 – 04 season, his fourth with Barcelona, Messi rapidly progressed through the club's ranks, debuting for a record five teams in a single campaign. After being named player of the tournament in four international pre-season competitions with the Juveniles B, he played only one official match with the team before being promoted to the Juveniles A, where he scored 18 goals in 11 league games. Messi was then one of several youth players called up to strengthen a depleted first team during the international break. At 16 years, four months, and 23 days old, he made his first team debut when he came on in the 75th minute during a friendly against José Mourinho's Porto on 16 November 2003. His performance, creating two chances and a shot on goal, impressed the technical staff, and he subsequently began training daily with the club's reserve side, Barcelona B, as well as weekly with the first team. After his first training session with the senior squad, Barça's new star player, Ronaldinho, told his teammates that he believed the 16-year-old would become an even better player than himself. Ronaldinho soon befriended Messi, whom he called "little brother," which greatly eased his transition into the first team.
