European football governing body Uefa on Wednesday announced that the five substitute rule will apply to this summer’s Euro 2020 tournament to subdue the possible effect of the pandemic as the competition cut across many nations. 

In a statement, UEFA concluded to allow five subs in the tournament since the rule is already in place for the World Cup qualification matches scheduled to run from March 2021 to March 2022”.

"The reasons for the rule remain logical towards the background of national and international football calendars that have been influenced by  Covid-19 pandemic," the statement continued.
UEFA added that the rule would also be in place for the Nations League finals in October in March next year.

The move to increase the number of substitutes from three to five has been in effect already in the UEFA Champions and Europa League, as well as domestic competitions all around the world.