Santos named his first shortlist, composed of players based abroad, on 10 May 2012, and the second, composed of Greece-based players on 17 May 2012, totalling a 25-player provisional list. On 28 May 2012, Santos announced his 23-man squad
On 11 May 2012, Advocaat named a provisional list of 26 players for the tournament.Vasili Berezutski and Roman Shishkin withdrew on 20 and 24 May respectively, Berezutski with a thigh injury and Shishkin due to a stomach complaint.Artem Dzyuba and Magomed Ozdoyev were excluded from the squad after a friendly game on 25 May, and Shishkin was replaced by Nababkin, thus finalizing the squad.
Denmark coach Morten Olsen named a 20-man squad for the tournament on 16 May, with the three remaining berths to be filled. Anders Lindegaard was selected on 19 May. Jores Okore and Nicklas Pedersen were selected on 24 May. Numbers were given the next day. On 29 May, Kasper Schmeichel replaced the injured Thomas Sørensen.
Vicente del Bosque named a provisional squad on 15 May 2012, but it did not include any Barcelona, Athletic Bilbao, or Chelsea players as the two Spanish sides were preparing for the Copa del Rey final on 25 May, while Chelsea were to take on Bayern Munich in the Champions League decider on 19 May. On 21 May, del Bosque called-up Chelsea players Fernando Torres and Juan Mata. On 27 May, del Bosque gave the final squad list, complete with Barcelona and Athletic Bilbao players.
On 7 May 2012, Giovanni Trapattoni announced his 23-man squad list for Euro 2012, along with a five-man stand-by list. The Republic of Ireland team is the only squad to contain no players playing in its domestic league, and its captain, Robbie Keane of LA Galaxy, is one of only two players in Euro 2012 who plays in a league outside of UEFA. Keith Fahey withdrew injured on 26 May and was replaced by Paul Green. On 29 May Kevin Foley was replaced by Paul McShane due to injury.
Blanc named his first shortlist on 9 May 2012, consisting of 12 players playing abroad. On 15 May 2012 second shortlist of 15 France-based players was announced, while on the same day Tottenham defender Younès Kaboul was ruled out of the tournament with a knee injury. On 29 May 2012 Blanc announced his final 23 man squad