Nearly half of London's Wembley stadium will be occupied by spectators from the round of 16 of the Euro, from June 26.
The semi-finals of the competition will therefore be contested with this increased capacity, against 22,500 spectators for the current category.
The Euro football semi-finals and final will be played in front of 40,000 fans at Wembley, the largest crowd in the UK for more than 15 months, as authorities raised the tonnage at public events on Monday -test.
"We want to gather more evidence on how we can safely resume big events," Culture Minister Oliver Dowden said.
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This represents for the Euro a move to nearly 50% of the capacity of Wembley stadium, despite the announcement by Prime Minister Boris Johnson of a four-week postponement of the complete lifting of restrictions linked to Covid-19, due to an increase in infections caused by the Delta variant.
Wimbledon also at 50%
The England-Scotland and England-Czech Republic group matches will be played with the reduced size of 22,500 people.
The change to 50% will be made on the occasion of the two round of 16 scheduled in London.
For the Euro, ticket holders for matches at Wembley must provide full proof of vaccination or a recent negative Covid-19 test result.
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Wimbledon will also be allowed to operate at 50% capacity during the two-week Grand Slam tournament, which was canceled last year due to the health crisis. The women's final on July 10 and the men's final the following day will be followed by a crowd of 15,000 spectators on center court.