After some initial confusion, Prevost was confirmed to be a White Sox fan by his brother, John. He's not a Cubs fan. In fact, Prevost is such a big White Sox fan that he was at Game 1 of the 2005 World Series at what is now known as Rate Field. Prevost made an appearance in the stands during a ninth-inning crowd shot:

Pope Leo XIV is truly a die-hard White Sox fan, as he looked as nervous as anyone watching his team try to close out Game 1 of the 2005 World Series.

The Fox Sports camera could have panned to any fan during the ninth inning of Game 1 of the 2005 World Series; it randomly landed on the future Pope Leo XIV.