The newborn son of FC Barcelona star Lionel Messi is already registered as a member of the Argentine club his dad supported while growing up in Rosario, fans of Newell’s Old Boys proclaimed at a match.

“Welcome to the world, Thiago Messi ... to the World of Lepers. Member No. 2,881,152,” said a banner held aloft by Newell’s fans during Sunday’s 1-1 tie with Godoy Cruz in the western city of Mendoza.