72 teams from 48 UEFA member associations participated in the 2003–04 UEFA Champions League. The 2003–04 competition was the 1st season with 16 team knockout stage ending the 4 group stage. England, Italy and Spain have 4 teams. France, Germany and Greece have 3 teams. Nine countries have 2 teams. The remaining 33 countries are only represented by their champions.
The 2003-04 competition had 3 qualification rounds to reach the group stage.
The 20 lower tier domestic champions played a home and away knockout round.
The 10 winners from 1st Qualifying join 18 additional teams, playing a home and away knockout round.
The 14 winners from 2nd Qualifying join the remaining 18 teams, playing a home and away knockout round .
|New teams|| Teams in |
|1st Qualifying||20 teams >>>||20 teams|
|2nd Qualifying|| 18 teams >>> || 10 winners from 1st Qualifying |
18 new teams
|3rd Qualifying|| 18 teams >>> || 14 winners from 2nd Qualifying |
18 new teams
|Group Stage|| 16 teams >>> || 16 winners from 3rd Qualifying |
16 new teams
The 16 winners from the 3rd Qualifying Round joined with the 16 automatic qualifying teams to form 8 groups of 4 teams, playing a home and away series.
The top 2 in each group advanced to the knockout stage.