Liverpool and Tottenham supporters' groups have called on sponsors to return Champions League final tickets to allow more fans to attend the showpiece in Madrid.
Fans for the two sides have received a total of 33,286 tickets from the 68,000 available at Atletico Madrid's Wanda Metropolitano stadium.
Liverpool's Spirit of Shankly (SOS) and Tottenham Hotspur supporter's Trutst (THST) have released a joint-statement, asking sponsors to "redress the balance."
"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," the statement read.
"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 percent 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 spilt that has supporters benefit."
Meanwhile, Arsenal have demanded an explanation from UEFA over their decision to allocate just 6,000 tickets to their supporters for the Europa League final against Chelsea.