There were nine groups. Six of these groups had six teams (one each from pots 1 to 6 below); the remaining three groups consisted of five teams (one each from pots 1 to 5 below). Group competition was a double round robin: each team hosted a game with every other team in its group. The first-place team in each group qualified, along with the second-place team with the most points against teams ranked in the top five in the group. The remaining eight second-place teams were paired for two-game play-offs, with the winner of each total goals tie qualifying for the finals. The two host countries completed the field of sixteen teams.
The pot allocations for the qualifying group stage draw were based on the UEFA national team coefficient rankings as of the end of 2009. The sole exception was the automatic placement of Spain, as reigning European champions, as the top-ranked team (their coefficient ranking would have also placed them in this position anyway). Each nation's coefficient was generated by calculating:
Armenia and Azerbaijan were drawn together in Group A during the draw ceremony, forcing UEFA to reassign Armenia to Group B, as Azerbaijan had refused to play in Armenia when they had been drawn together during UEFA Euro 2008 qualifying.
If two or more teams are equal on points on completion of the group matches, the following criteria are applied to determine the rankings.
higher number of points obtained in the group matches played among the teams in question;
superior goal difference from the group matches played among the teams in question;
higher number of goals scored in the group matches played among the teams in question;
higher number of goals scored away from home in the group matches played among the teams in question;
if, after applying criteria 1) to 4) to several teams, two or more teams still have an equal ranking, the criteria 1) to 4) will be reapplied to determine the ranking of these teams. If this procedure does not lead to a decision, criteria 6) to 10) apply;
superior goal difference in all group matches;
higher number of goals scored in all group matches;
higher number of goals scored away from home in all group matches;
The following 18 dates were reserved for group matches in qualifying:
3–4 and 7 September 2010
8–9 and 12 October 2010
25–26 and 29 March 2011
3–4 and 7 June 2011
2–3 and 6 September 2011
7–8 and 11 October 2011
For the first time, Tuesday evenings replaced Wednesday evenings for midweek qualifying fixtures where two matchdays occurred in the same week. This was in order to allow players an extra day to return to their clubs for domestic duty the following week. Consequently, teams were permitted to move the earlier weekend match forward to the Friday evening.
The highest ranked second placed team from the groups qualified automatically for the tournament, while the remainder entered the play-offs. As some groups contain six teams and some five, matches against the sixth-placed team in each group were not included in this ranking. As a result, a total of eight matches played by each team count toward the purpose of the second-placed ranking table.
Source: UEFA Rules for classification: 1) Points; 2) Goal difference; 3) Goals scored; 4) Away goals scored; 5) Position in the UEFA national team coefficient ranking system; 6) Fair play ranking; 7) Drawing of lots.
The eight remaining second-placed teams contested two-legged play-offs to determine the last four qualifiers for the finals. The teams were seeded for the play-off draw according to the UEFA national team coefficient rankings updated after the completion of the qualifying group stage. The draw for the play-offs was held on 13 October 2011 in Kraków, Poland.