The world's largest services network published its 23rd annual Money League table for football, with Barca setting the standard for the first time
Barcelona top the Deloitte Money League for the first time after also becoming the only club to break the €800 million ($891m, £686m) mark for revenue.
The Camp Nou club generated €840.8m ($936m, £721m) during the 2018-19 season, seeing them topple bitter rivals Real Madrid at the top of Deloitte's table.
Deloitte expect Barca to remain number one in the 2021 standings, with the Spanish champions on course to become the first club to generate revenue of over one billion euros in the coming years.