UEFA Euro 2020 squads

At the start of April 2021, UEFA stated they were considering allowing tournament squads to be expanded from the usual 23 players, used at every European Championship since 2004, following calls from national team managers in case of a possible COVID-19 outbreak in a team, as well as to reduce player fatigue caused by the fixture congestion of the prior season.^[5] On 27 April, it was reported that the UEFA National Team Competitions Committee had approved the expansion of squads to 26 players, subject to confirmation by the UEFA Executive Committee.^[6]

On 4 May 2021, the Executive Committee confirmed the use of 26-player squads. However, teams still could only name a maximum of 23 players on the match sheet for each tournament fixture (of which 12 were substitutes), in line with the Laws of the Game.^[4]

Players who either tested positive for SARS-CoV-2 or had been declared as "close contacts" of a positive SARS-CoV-2 tested person – and therefore were put in isolation by the decision of health authorities – were considered cases of serious illness and could therefore be replaced before the first match.^[4]

If a group of players of a team were placed into mandatory quarantine or self-isolation prior to a match following a decision from national or local health officials due to positive SARS-CoV-2 tests, and fewer than 13 players were available (including at least one goalkeeper), additional players could have been called up to meet the minimum of 13 players required. In such a case, an equivalent number of quarantined players must have been definitively withdrawn from the 26-player list.^[7]

Any player who had been replaced on the player list after the submission deadline of 1 June 2021 could not be readmitted to the list.^[4]