The competition was traditionally a pure knockout tournament. All ties were two-legged, including the final. Starting with the 1997–98 season
Before the 2004–05 season
From the 2004–05 season, the competition started with two knockout qualifying rounds held in July and August. Participants from associations ranked 18 and lower entered the first qualifying round with those from associations ranked 9–18 joining them in the second qualifying round. In addition, three places in the first qualifying round were reserved for the UEFA Fair Play ranking winners (until 2015–16), and eleven places in the second qualifying round for the UEFA Intertoto Cup winners.
Winners of the qualifying rounds then joined teams from the associations ranked 1–13 in the first round proper. In addition, non-qualifiers in the third qualifying round of the Champions League also joined the competition at this point along with the current title-holders (unless they had qualified for the Champions League via their national league), for a total of 80 teams in the first round.
After the first knockout round, the 40 survivors entered a group phase, with the clubs being drawn into eight groups of five each. Unlike the Champions League group phase, the UEFA Cup group phase was played in a single round-robin format, with each club playing two home and two away games. The top three teams in each of the eight groups qualified for the main knockout round along with the eight third-placed teams in the Champions League group phase. From then on a series of two-legged knockout ties were played before a single-legged final, traditionally held on a Wednesday in May, exactly one week before the Champions League final.
In the 2009–10 season, the competition was rebranded as the UEFA Europa League to raise its profile. Eight more teams qualified for the group stage, which consisted of 12 groups with four teams each (in a double round-robin); the top two teams in each group advanced. The competition was then similar to the previous format, with four rounds of two-legged knockout rounds and a one-off final held at a neutral ground which met UEFA's Category Four stadium criteria
Qualification changed significantly. Associations ranked 7–9 in the UEFA coefficients sent the cup winners and three (two since the 2015–16 season) other teams to the UEFA Europa League qualification; all other nations sent a cup winner and two other teams, except for Andorra and San Marino (who sent a cup winner and a runner-up) and Liechtenstein (who sent only a cup winner). Since Gibraltar was accepted as a full UEFA member at the 24 May 2013 UEFA Congress
Although the other teams were the next-highest-ranked in each domestic league (after those qualifying for the UEFA Champions League), France and England continued to use one spot for their league-cup winners. With the abolition of the Intertoto Cup, all participants in the Europa League are qualified through domestic routes. The higher an association is ranked in the UEFA coefficients, the later its members begin the qualification. However, every team except for the title-holder (until the 2014–15 season) and the highest-ranked (the cup winner or the best Europa League-qualified) from the top (six from 2012 to 2015, 12 since the 2015–16 season) associations had to play at least one qualification round.
Except for the teams mentioned, all teams eliminated in the Champions League preliminary round, qualifying rounds and play-off round are transferred to the Europa League. The 12 winners and runners-up in the group stage advance to the knockout round, with eight third-placed teams from the Champions League group stage.
The distribution was changed in 2014 to broaden the competition's appeal, giving the Europa League champions a Champions League qualification berth, more teams automatically qualified for the group stage. If cup winners had already qualified for European competition through league performance, their place in the league is vacated and goes to the best-ranked teams not qualified for European competition; the cup runner-up is no longer qualified through the cup berth. These rules became effective for the 2015–16 season. |