San Lorenzo de Almagro

From the team's website:

"Cardinal Jorge Bergoglio was designated as the new Pope at the Vatican. On top of how special this announcement is for Argentina, Pope Francis is also a fervent fan of San Lorenzo de Almagro. The Club is privileged to have Pope Francis among its members (Club member #88,235)."

ESPN says:

"Jorge Mario Bergoglio, elected as the new pope on Wednesday, is a fan of San Lorenzo who lives in "a permanent state of suffering" for the Argentine club."