Uefa writes in a statement.
Both finalists are awarded 2,000 tickets each and 2,000 are awarded to the public.
The rest goes to organizers, Uefa, national federations, sponsors and the media.
Spectators may need to show that they have been vaccinated or a negative coronary test.
“Supporters traveling from abroad will need to follow the entry rules and requirements that apply at the time of the final.
No exemptions will be granted to ticket holders ", Uefa writes in a statement.
Manchester United crushed Roma 6-2 at home in the first semi-final meeting and have one foot in the final.
In the second semi-final, Villarreal leads 2-1 against Arsenal before the return in London.
The return matches are played on Thursday.
ARCHIVE: See United's turn against Roma (April 29)
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See United's turn towards Roma Photo: Bildbyrån.