Liverpool and Tottenham supporters' trusts have urged sponsors to return their Champions League tickets to help fans.
The two Premier League sides will contest just the second-ever all-English Champions League final on June 1 at Atletico Madrid's Wanda Metropolitano stadium.
However, UEFA have allocated just over 50 per cent of the tickets to the clubs' fans.
A joint statement from Spirit of Shankly and Tottenham Supporters' Trusts said: "Spirit of Shankly and Tottenham Hotspur Supporters' Trust - the independent official fan groups of LFC and THFC - are calling on the main sponsors of the UEFA Champions League to return a proportion of the tickets they have received for the Champions League final to the pot for supporters of both clubs.
"We ask Nissan, Playstation, Gazprom, PepsiCo, Banco Santander, Mastercard, Heineken and Expedia Group to help redress the balance in the current unfair allocation that means fans of both competing clubs receive less than 25% of available tickets.
"As major sponsors of the UEFA Champions League, your companies appreciate the passion and dedication of the fans who follow their teams and make every game a spectacle.
"But many of those fans who have followed their club throughout this season will miss out on the biggest game of all, as will thousands more loyal supporters.
"SOS and THST believe such a gesture by the sponsors would help lift the occasion by increasing the number of passionate fans inside the stadium, and increase each brand's standing on a global scale.
"We also ask that each sponsor lobbies UEFA to allocate tickets for future finals on a fairer, more equitable split that has supporters benefit."