4. Arsenal | Fans: 598,000

Next up are Premier League side Arsenal, who are fourth on the list despite the fact they have not won a single trophy since 2005.

The Gunners have a large supporter base - and regularly sell out their home matches at the Emirates Stadium - so it's no surprise that they feature in this top five.

The £42m summer signing of Mesut Ozil probably boosted numbers a little, too.

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Barcelona
Manchester United
Arsenal
Football