On 16 November 2003, 16-year-old Lionel Messi made his Barca's first-team debut as a 75th-minute substitute in a friendly against José Mourinho's FC Porto.
The world would never be the same.
Messi scored 612 goals in 698 appearances for Barcelona so far.
16 years past, he stands on top of football world.
Related：
Barcelona
Messi
MohammedKhubaib10
302
THE GREATEST OF ALL TIME
4pro
167
The beginning of an era