Brown said: “It is great for both clubs to team up on this issue – I think it reminds fans to be aware of the impact they have on the environment when they travel to support their team.

“I encourage supporters to think about sustainable ways to follow football and when they do travel in European competitions it is important to show respect to opposition fans, their home city or town, stadium and culture.”

Gordillo, who made more than 300 appearances for Real Betis over two spells, added: “It is an honour for us to join forces with Manchester United.

“We feel really happy and proud to work side-by-side for sustainability with such a big club.”

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