76 teams from 52 UEFA member associations participated in the 2009–10 UEFA Champions League. The 2009–10 competition was the 7th season with 16 team knockout stage. England, Italy and Spain have 4 teams. France, Germany and Russia have 3 teams. Nine countries have 2 teams. The remaining 37 countries are only represented by their champions.
The 2009–10 UEFA Champions League qualification rounds were adjusted from previous seasons.
The 4 lower tier domestic champions played a home and away knockout round.
The 2 winners from 1st Qualifying join 32 additional domestic champions, playing a home and away knockout round.
The 17 winners from 2nd Qualifying join 13 additional teams, playing a home and away knockout round.
The 15 winners from 3rd Qualifying join the remaining 5 teams, playing a home and away knockout round.
|New teams|| Teams in |
|1st Qualifying||4 teams >>>||4 teams|
|2nd Qualifying|| 32 teams >>> || 2 winners from 1st Qualifying |
32 new teams
|3rd Qualifying|| 13 teams >>> || 17 winners from 2nd Qualifying |
13 new teams
|Play-offs|| 5 teams >>> || 15 winners from 3rd Qualifying |
5 new teams
|Group Stage|| 22 teams >>> || 10 winners from Play-offs |
22 new teams
The 10 winners from the Play-offs joined with the 22 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.