Bilbao, Amsterdam, Bucharest and Glasgow have confirmed fans will be able to attend the games they are hosting for the European Championship.
UEFA had set a deadline of April 7 for host nations to reveal minimum capacities to the governing body, with president Aleksander Ceferin previously saying that the tournament would not be played behind closed doors.
Despite a third wave of coronavirus spreading through mainland Europe, with the vaccine rollout looking to catch-up, Spain has confirmed that at least 25% of its Bilbao stadium will be open to spectators, amounting to approximately 13,000 fans.
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But that is only if checks are passed by the local health authority, and that infection rates are low with hospitals not overwhelmed.
The Scottish government have given approval to allow in up to 25 per cent capacity for the four Euros matches to be held at Hampden Park.
The Dutch football association has said a minimum of 12,000 supporters will be permitted to watch fixtures at the Johan Cruyff Arena, with the final number to be determined at a later stage by ministers in the Netherlands.

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Rather than announcing that capacity may increase, Romania’s sports ministry has said a maximum number of 13,000 will be able to attend matches in Bucharest.
London is yet to reveal it's plan, although the UK government has already announced that it hopes all coronavirus restrictions in England will be lifted by June 21.
21,000 will attend a test event at Wembley on May 15 for the FA Cup final and there have been reports that something close to full capacity could be allowed by the time of the Euros.
The Football Association of Ireland (FAI) has told UEFA that it cannot guarantee that fans will be able to attend Euro 2020 games in Dublin, raising the prospect of matches being moved elsewhere.
"The Football Association of Ireland, on advice and guidance from the Government, has today notified UEFA that owing to the Covid-19 pandemic it is not in a position at this point to provide assurances on minimum spectator levels at the UEFA EURO 2020 matches due to be held in Dublin in June," the FAI said in a statement.
The Spanish football federation has declared Bilbao will be unable to hold Euro 2020 matches with spectators, endangering the city's chances of remaining as a host city for the rescheduled tournament.
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