The complaint, filed by Leigh Day at Liverpool court and targets UEFA, named in February by an independent report as the main culprit in the incidents "that almost led to disaster".
Two other law firms, representing nearly 2000,<> other fans, had also announced their intention to sue UEFA.
Leigh Day believes that by failing to provide a safe and peaceful environment for spectators, UEFA could be held legally liable for injuries or psychological scars suffered by Reds fans.
Endless waiting, supporters and families sprayed with tear gas or victims of theft... The policing of this final, delayed by 37 minutes and won by Real Madrid (1-0), had given rise to scenes of chaos in Saint-Denis, causing a lively controversy in France and England.
UEFA and French authorities had initially singled out English fans, accusing them of arriving late at the stadium and presenting forged tickets en masse.
The independent investigation had brushed aside these accusations, denouncing the "primary responsibility" of UEFA, or that of the French Football Federation (FFF), as well as the "misconceptions" of the French police.
In mid-March, in a podcast hosted by former Manchester United player Gary Neville, UEFA President Aleksander Ceferin, re-elected Wednesday for 4 years at the head of the institution, said he was "sorry" for what had happened.
"Believe me, there is not a person at UEFA who is not terribly sorry (...) Thank God, nothing dramatic happened," he said.
A few days earlier, UEFA had announced that it would refund all tickets of English fans, a gesture deemed insufficient by the three law firms.
© 2023 AFP