Real Madrid are the richest football club by revenue for the 11th straight year, while La Liga rivals Barcelona leapfrogged Manchester United into second, according to the Deloitte's Football Money League.
Real topped the list published on Thursday, with an annual revenue of €577m ($629.3m) as the combined figure for the top 20 Money League clubs rose by 8 percent to a record high of €6.6bn ($7.2bn).
Barcelona's stunning on-field success last year, when they claimed five of the six trophies on offer, including La Liga and the Champions League, helped them move above Manchester United, who fell to third.
It was the first time that the top three clubs in the Football Money League have all passed the €500m ($545m) revenue mark.
Spanish giants Real, who clinched a record-extending 10th European Cup in 2014, were buoyed by an increase in commercial revenues which rose by €22.7m ($24.7m) from the previous season.
"There are a number of metrics, both financial and non-financial, that can be used to compare clubs including attendance, worldwide fan base, broadcast audience and on-pitch success," the report said.
"In the Money League, the focus is on the clubs' ability to generate revenue from matchday, broadcast rights and commercial sources, and rank them on that basis."
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