The Eurostadium in Brussels was due to host four group matches and one Last 16 game, but it won't be ready in time so those matches have been reassigned to Wembley Stadium in London.
Belgium's capital city has been ruled out as a planned new stadium is still to be built and Uefa has not received the necessary guarantees.
English soccer's national stadium, which was chosen in 2014 to host the final three games, now also has three group stage games and a round of 16 fixture.
London will host seven games in total - including the final and one semi-final - after Brussels was stripped of its host city status.
The Republic of Ireland and Spain will face off in the group stages of Euro 2020 should both teams qualify after Dublin and Bilbao were paired up as hosts of Group E for the cross-continental finals.
"They still don't have the documents".
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In addition to the host-city pairs, UEFA also announced that the opening match of the tournament will be played at Rome's Stadio Olimpico. They didn't expect a decision until January and they did not know whether that would be yes or no.
"Experts from administration had the opinion it was a high risk for UEFA if we wait".
Ceferin said that the development of the Eurostadium had run into delays involving the applications for construction and environmental permits.
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Judy Scott on turned toward Slager on Thursday and said her faith in God gives her the ability to forgive him for killing her son. Before a state retrial and a federal trial, Slager in May pleaded guilty to violating Scott's civil rights in federal court.
Koen De Brabander, chief executive of the Belgian Football Association, said in a statement that they did everything they could to make UEFA hold off.
"A huge amount of work has gone into preparation for the tournament and we are making enormous progress in preparing the Aviva Stadium for when it becomes a focus for worldwide attention during this prestigious competition".
Here's where the group-stage matches will be played.
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"The concept of Euro 2020 to 13 different countries was devised to allow smaller countries, like Wales, to have a unique opportunity of being involved in staging a major tournament", it said.