According to Matías Maria, a Chacarita Juniors fan, the friendship originated in the 1990s and early 2000s, largely due to the number of games São Paulo played in the Copa Libertadores and the fact that they shared the same colours. This led to the Chacarita Juniors fans taking an interest in the team and attempting to follow their games in the Copa Libertadores. The bond between the two teams' fans grew stronger during the 2005 Libertadores campaign, when Chacarita supporters joined the Brazilian fans at the Monumental de Núñez to cheer on the São Paulo against River Plate. Since then, it's common to see São Paulo jerseys at Chacarita's Villa Maipú stadium, and the connection between the fans has only grown closer over the years.