Barcelona becoming the first to see its annual revenues - at 840 million euros, or 890 million dollars - break through the 800 million euros barrier.
However, United could potentially slip next year due to a lack of Champions League action this term, with Bayern Munich (€660.1m) and Paris Saint-Germain (€635.9m) the biggest threats to knocking them out of the top three.
Combined revenues among the top 20 increased 11% from a year earlier to a record € 9.3 billion (just under £ 7.9 billion).
He added: "I am not sure if I could win the Champions League, I haven't been involved in many Champions League games, so my experience isn't really up there".
'We have a chance this season, it's in our hands.
The club faces the prospect of a second consecutive season without broadcast earnings from the Champions League.
Matchday 23 will see Watford play Tottenham Hotspur, Manchester City host Crystal Palace, Sheffield United travel to Arsenal, Newcastle United entertain Chelsea, the mouthwatering clash between Liverpool and Manchester United takes place at Anfield and more.
Jürgen Klopp quickly turned his attention towards Liverpool's next test in the Premier League as he expects his ranks to be boosted by players returning from injury.
"Barcelona gained from operational changes like bringing merchandising and licensing activities in-house and is a clear example of a club adapting to changing market conditions", said Dan Jones, a partner in the Deloitte group. With the news that the African Cup Of Nations will be moving back to January from 2021, the Reds could find themselves without some of their star men for a crucial chunk of forthcoming Premier League seasons.
"With the club expecting further growth of 30m euros (£25.5m) in commercial revenues and total revenue of nearly 880m euros (£749.5m) in 2019-20, we expect them to retain the top spot in next year's edition".
In fact, eight of the top 20 are Premier League sides.