Uefa's allocation for wheelchair users at the Champions League final "is bordering on exclusion and discrimination", says the Liverpool Disabled Supporters Association (LDSA).
Uefa says it has provided 93 wheelchair positions for the match, with each team getting 38.
"We're really angry about it," said Ted Morris, secretary of the LDSA.
Level Playing Field - a campaign group for disabled sports fans - has written to Uefa to ask about the issue.
The final is to be played in Paris after St Petersburg in Russia was stripped of the match following the nation's invasion of Ukraine.