Manchester United have topped the Premier League rich list for a 23rd straight year - but their dominance may soon end.

United may be languishing in fifth, 27 points behind runaway leaders Liverpool in the title race, but only Barcelona and Real Madrid earned more than them last season.

United’s revenue of £627.1million for 2018-19 was almost £100m more than what Manchester City and Liverpool earned and was only exceeded globally by the La Liga giants.

City were the next richest Premier League club and their earnings of £538.2m put them sixth overall, just ahead of Liverpool in seventh with revenues of £533m.

United have been the richest club since Deloitte first compiled their Money League in 1997, but the accounting experts feel the Red Devils' pre-eminence may be coming to an end.

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Deloitte are forecasting reduced revenues of between £560-580m for United this season, in part due to a second campaign without the riches of the Champions League.

Deloitte’s Dan Jones claims United may finally be overtaken by City or Liverpool.

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“United have been the top English club since we started the Money League, but that could come under a bit of pressure when we do it in 2021,” he said.

“That will cover this season when Liverpool are having a tremendous season on the pitch, so we think there’s a possibility of United losing that number one position.

(Image: ALI HAIDER/EPA-EFE/REX)

“It’s definitely a possibility that United will lose that place. Depending on where they are in that range of projected revenue and if City and Liverpool do well in the Champions League, it could be very, very close.”

Barcelona were the word’s richest club with earnings of £741m, ahead of Real in second with £667.5m.

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Tottenham , boosted by last season’s Champions League final appearance, were eighth on £459.3m and Chelsea were ninth with £452.2m.

Bayern Munich were fourth and Paris Saint-Germain fifth, with Juventus completing the top 10.