UEFA president Michel Platini has revealed the concept of one or two countries staging major tournaments may be abandoned for Euro 2020.
Turkey had been favourites to host the event but their bid has hit difficulties due to a desire to host the Olympic Games in Istanbul in the same year.
And Platini has confirmed a radical alternative is now being considered.
"The Euros in 2020 could be held all over Europe," said Platini.
"It could be either one country and 12 stadiums or one stadium in 12 or 13 cities."