European soccer's governing body said on Friday that "at least" 9,000 tickets would be reserved each for Liverpool and opponents Sevilla at the 35,000-capacity St Jakob Park.
"We hope that in future years, UEFA will...stage the final at a ground that allows more genuine supporters of the final clubs to attend," said the Liverpool supporters' club Spirit of Shankly.
"It is crystal clear that this amount of tickets will not be enough... Tens of thousands of supporters will have attended every home game this season and a large number will miss out."
It also complained of "the cost of travel increasing by the minute from greedy travel operators", a lack of accommodation and lack of public transport out of the city after midnight.
"It is pretty clear that Basel is not best equipped to deal with such large numbers that we have witnessed in previous years," it added.
UEFA spokesman Pedro Pinto said the final venues were chosen almost two years in advance due to "the enormous logistical effort involved."
He said the stadium, which hosted matches at Euro 2008, as one of Europe's "elite venues", adding that capacity was just one factor taken into account.
"UEFA tends to select slightly smaller, top-quality venues for the UEFA Europa League final," he said. "This means UEFA can give more of its national associations an opportunity to host a club final.”
"The number of supporters requesting final tickets varies from club to club, and of course it is impossible to predict in advance which clubs will reach the final," he said, adding that stadium capacity at recent finals had been "very satisfactory." UEFA advised ticketless fans not to approach the stadium due to "very tight" security.
Liverpool manager Juergen Klopp told reporters on Friday that there was no point complaining about the meagre ticket allocation, but he urged supporters without tickets to travel to Switzerland all the same.
"It's worth going even if you don't have a ticket to enjoy the city. We can't think about the size of the stadium. If you ask who wants to see this final you will find 30 million people so there is no chance. It's like this."
Basel’s city government, which has already announced street and tram line closures around the stadium, was closed for a public holiday and could not be reached for comment.
The ticket allocation for the Champions League final in Milan on May 28 has also caused controversy, with only 40,000 of the 71,500 tickets available going to fans of finalists Real Madrid and Atletico Madrid, and 6,000 to other supporters.
The rest are reserved for officials, sponsors and corporate hospitality.
“I don’t like it but I expect it and we have to accept that because no matter how much we complain we won’t get anywhere,” said Jacinto Fernandez of the Real Madrid supporters' club Guadarrama.
He did not take issue with tickets being sold to Italian fans but said: “I have more of a problem with the number of tickets UEFA take and hand out internally. It’s abusive.”
(Reporting by Brian Homewood; additional reporting by Richard Martin)
